IS61/64WV204816ALL
IS61/64WV204816BLL
Integrated Silicon Solution, Inc.- www.issi.com 1
Rev. A
10/27/2016
2Mx16 HIGH-SPEED ASYNCHRONOUS
CMOS STATIC RAM WITH 3.3V/1.8V SUPPLY
FEATURES
High-speed access time: 10ns, 12ns
High- performance, low power CMOS process
Multiple center power and ground pins for
greater noise immunity
Easy memory expansion with CS# and OE#
TTL compatible inputs and outputs
Single power supply
– 1.65V-2.2V VDD (IS61/64WV204816ALL)
– 2.4V-3.6V VDD (IS61/64WV204816BLL)
Packages available :
- 48 ball mini BGA (6mm x 8mm)
- 48 pin TSOP (Type I)
Industrial and Automotive temperature support
Lead-free available
Data Control for upper and lower bytes
DESCRIPTION
The ISSI IS61/64WV204816ALL/BLL are high-speed, 32M
bit static RAMs organized as 2048K words by 16 bits. It is
fabricated using ISSI's high-performance CMOS technology.
This highly reliable process coupled with innovative circuit
design techniques, yields high-performance and low power
consumption devices.
When CS# is HIGH (deselected), the device assumes a
standby mode at which the power dissipation can be
reduced down with CMOS input levels. Easy memory
expansion is provided by using Chip Enable and Output
Enable inputs. The active LOW Write Enable (WE#)
controls both writing and reading of the memory. A data
byte allows Upper Byte (UB#) and Lower Byte (LB#) access.
The device is packaged in the JEDEC standard 48-Pin
TSOP (TYPE I) and 48-pin mini BGA (6mm x 8mm).
FUNCTIONAL BLOCK DIAGRAM
COLUMN IO
CS#
WE#
LB#
CONTROL
CIRCUIT
I/O
DATA
CIRCUIT
2048K x 16
MEMORY
ARRAY
DECODER
VDD
VSS
A0 – A20
I/O0 – I/O7
Lower Byte
I/O8 – I/O15
Upper Byte
UB#
OE#
Copyright © 2016 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time
without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to
obtain the latest version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can
reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such
applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
OCTOBER 2016
IS61/64WV204816ALL
IS61/64WV204816BLL
Integrated Silicon Solution, Inc.- www.issi.com 2
Rev. A
10/27/2016
PIN CONFIGURATIONS
48-Pin mini BGA (6mm x 8mm)
LB# A0OE# A1 A2 NC
I/O8 A3UB# A4 CE# I/O0
I/O9 A5I/O10 A6 I/O1 I/O2
VSS A17I/O11 A7 I/O3 VDD
VDD NCI/O12 A16 I/O4 VSS
I/O14 A14I/O13 A15 I/O5 I/O6
I/O15 A12A19 A13 WE# I/O7
A18 A9A8 A10 A11 A20
1 2 3 4 5 6
A
B
C
D
E
F
G
H
48-Pin TSOP ,TYPE I ( 12mm x 20mm )
A2
A1
A0
NC
CS#
I/O0
I/O1
I/O2
I/O3
VDD
VSS
I/O4
I/O5
I/O6
I/O7
WE#
A19
A18
A17
A16
A15
A7
A8
OE#
UB#
LB#
I/O15
I/O14
I/O13
I/O12
VDD
VSS
I/O11
I/O10
I/O9
I/O8
A 9
A10
A11
A12
A13
A14
3
4
5
6
7
8
9
10
11
12
14
13
15
16
17
18
34
33
32
31
30
29
28
27
26
25
23
24
22
21
20
19
44
43
42
41
40
39
38
37
36
35
45
A4
A3
A5
A6
1
2
48
47
46
NC
A20
PIN DESCRIPTIONS
A0-A20
Address Inputs
I/O0-I/O15
Data Inputs/Outputs
CS#
Chip Enable Input
OE#
Output Enable Input
WE#
Write Enable Input
LB#
Lower-byte Control
(I/O0-I/O7)
UB#
Upper-byte Control
(I/O8-I/O15)
NC
No Connection
VDD
Power
VSS
Ground
IS61/64WV204816ALL
IS61/64WV204816BLL
Integrated Silicon Solution, Inc.- www.issi.com 3
Rev. A
10/27/2016
FUNCTION DESCRIPTION
SRAM is one of random access memories. Each byte or word has an address and can be accessed randomly. SRAM
has three different modes supported. Each function is described below with Truth Table.
STANDBY MODE
Device enters standby mode when deselected (CS# HIGH). The input and output pins (I/O0-15) are placed in a high
impedance state. CMOS input in this mode will maximize saving power.
WRITE MODE
Write operation issues with Chip selected (CS#) and Write Enable (WE#) input LOW. The input and output pins (I/O0-
15) are in data input mode. Output buffers are closed during this time even if OE# is LOW. UB# and LB# enables a
byte write feature. By enabling LB# LOW, data from I/O pins (I/O0 through I/O7) are written into the location specified
on the address pins. And with UB# being LOW, data from I/O pins (I/O8 through I/O15) are written into the location.
READ MODE
Read operation issues with Chip selected (CS# LOW) and Write Enable (WE#) input HIGH. When OE# is LOW, output
buffer turns on to make data output. Any input to I/O pins during READ mode is not permitted. UB# and LB# enables a
byte read feature. By enabling LB# LOW, data from memory appears on I/O0-7. And with UB# being LOW, data from
memory appears on I/O8-15.
In the READ mode, output buffers can be turned off by pulling OE# HIGH. In this mode, internal device operates as
READ but I/Os are in a high impedance state. Since device is in READ mode, active current is used.
POWER UP INITIALIZATION
The device includes on-chip voltage sensor used to launch POWER-UP initialization process.
When VDD reaches stable level, the device requires 150us of tPU (Power-Up Time) to complete its self-initialization
process.
When initialization is complete, the device is ready for normal operation.
tPU 150 us
VDD
Stable VDD
0V Device Initialization Device for Normal Operation
TRUTH TABLE
Mode
CS#
WE#
OE#
LB#
UB#
I/O0-I/O7
I/O8-I/O15
VDD Current
Not Selected
H
X
X
X
X
High-Z
High-Z
ISB1, ISB2
Output Disabled
L
H
H
L
L
High-Z
High-Z
ICC
L
H
H
H
L
High-Z
High-Z
Read
L
H
L
L
H
DOUT
High-Z
ICC
L
H
L
H
L
High-Z
DOUT
L
H
L
L
L
DOUT
DOUT
Write
L
L
X
L
H
DIN
High-Z
ICC
L
L
X
H
L
High-Z
DIN
L
L
X
L
L
DIN
DIN
IS61/64WV204816ALL
IS61/64WV204816BLL
Integrated Silicon Solution, Inc.- www.issi.com 4
Rev. A
10/27/2016
ABSOLUTE MAXIMUM RATINGS
AND Operating Range
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Parameter
Value
Unit
Vterm
Terminal Voltage with Respect to VSS
–0.5 to VDD + 0.5V
V
VDD
VDD Related to VSS
–0.3 to 4.0
V
tStg
Storage Temperature
–65 to +150
C
PT
Power Dissipation
1.0
W
Note:
1. Stress greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification
is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
PIN CAPACITANCE (1)
Parameter
Symbol
Test Condition
Max
Units
Input capacitance
CIN
TA = 25°C, f = 1 MHz, VDD = VDD(typ)
6
pF
DQ capacitance (IO0–IO15)
CI/O
8
pF
Note:
1. These parameters are guaranteed by design and tested by a sample basis only.
OPERATING RANGE
Range
Ambient
Temperature
PART NUMBER
VDD
SPEED (MAX)
Commercial
0C to +70C
IS61WV204816ALL
1.65V – 2.2V
10 ns
IS61WV204816BLL
2.4V – 3.6V
Industrial
-40C to +85C
IS61WV204816ALL
1.65V – 2.2V
10 ns
IS61WV204816BLL
2.4V – 3.6V
Automotive (A3)
-40C to +125C
IS64WV204816ALL
1.65V – 2.2V
12 ns
IS64WV204816BLL
2.4V – 3.6V
IS61/64WV204816ALL
IS61/64WV204816BLL
Integrated Silicon Solution, Inc.- www.issi.com 5
Rev. A
10/27/2016
AC TEST CONDITIONS (OVER THE OPERATING RANGE)
Parameter
Unit
(1.65V~2.2V)
Unit
(2.4V~3.6V)
Input Pulse Level
0V to VDD
0V to VDD
Input Rise and Fall Time
1.5 ns
1.5 ns
Output Timing Reference Level
½ VDD
½ VDD
R1 (ohm)
13500
319
R2 (ohm)
10800
353
VTM (V)
1.8V
3.3V
Output Load Conditions
Refer to Figure 1 and 2
AC TEST LOADS
Output
Zo = 50 ohm 50 ohm
30 pF,
Including
jig
and scope
VDD/2
R1
R2
VTM
OUTPUT 5pF,
Including
jig
and scope
R1
R2
VTM
OUTPUT 5pF,
Including
jig
and scope
FIGURE 1 FIGURE 2
IS61/64WV204816ALL
IS61/64WV204816BLL
Integrated Silicon Solution, Inc.- www.issi.com 6
Rev. A
10/27/2016
DC ELECTRICAL CHARACTERISTICS
DC ELECTRICAL CHARACTERISTICS-I
(OVER THE OPERATING RANGE)
VDD = 1.65V – 2.2V
Symbol
Parameter
Test Conditions
Min.
Max.
Unit
VOH
Output HIGH Voltage
IOH = -0.1 mA
1.4
—
V
VOL
Output LOW Voltage
IOL = 0.1 mA
—
0.2
V
VIH
(1)
Input HIGH Voltage
1.4
VDD + 0.2
V
VIL
(1)
Input LOW Voltage
–0.2
0.4
V
ILI
Input Leakage
GND < VIN < VDD
–1
1
µA
ILO
Output Leakage
GND < VIN < VDD, Output Disabled
–1
1
µA
Note:
1. VILL(min) = -1.0V AC (pulse width < 10ns). Not 100% tested.
VIHH (MAX) = VDD + 1.0V AC (PULSE WIDTH < 10NS). NOT 100% TESTED.
VDD = 2.4V – 3.6V
Symbol
Parameter
Test Conditions
Min.
Max.
Unit
VOH
Output HIGH
Voltage
2.4V ~ 2.7V
VDD = Min., IOH = -1.0 mA
2.0
—
V
2.7V ~ 3.6V
VDD = Min., IOH = -4.0 mA
2.2
VOL
Output LOW
Voltage
2.4V ~ 2.7V
VDD = Min., IOL = 2.0 mA
—
0.4
V
2.7V ~ 3.6V
VDD = Min., IOL = 8.0 mA
—
0.4
VIH
(1)
Input HIGH Voltage
2.4V ~ 2.7V
2.0
VDD + 0.3
V
2.7V ~ 3.6V
2.0
VIL
(1)
Input LOW Voltage
2.4V ~ 2.7V
–0.3
0.6
V
2.7V ~ 3.6V
–0.3
0.8
ILI
Input Leakage
VSS < VIN < VDD
–2
2
µA
ILO
Output Leakage
VSS < VIN < VDD, Output Disabled
–2
2
µA
Note:
1. VIL(min) = -0.3V DC ; VIL(min) = -2.0V AC (pulse width 2.0ns). Not 100% tested.
VIH (max) = VDD + 0.3V DC ; VIH(max) = VDD + 2.0V AC (pulse width 2.0ns). Not 100% tested.
IS61/64WV204816ALL
IS61/64WV204816BLL
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Rev. A
10/27/2016
POWER SUPPLY CHARACTERISTICS-II FOR POWER
(1, 2) (OVER THE OPERATING RANGE)
IS61/64WV204816ALL (VDD = 1.65V – 2.2V) & IS61/64WV204816BLL (VDD = 2.4V – 3.6V)
Symbol
Parameter
Test Conditions
Grade
-10
Max.
-12
Max.
Unit
ICC
VDD Dynamic Operating
Supply Current
VDD = MAX, IOU T = 0 mA, f = fMAX
Com.
90
85
mA
Ind.
100
95
Auto.
140
135
ICC1
Operating Supply Current
VDD = MAX,
IOUT = 0 mA, f = 0
Com.
80
80
mA
Ind.
90
90
Auto.
110
110
ISB1
TTL Standby Current
(TTL Inputs)
VDD = MAX,
VIN = VIH or VIL
CS# ≥ VIH , f = 0
Com.
60
60
mA
Ind.
70
70
Auto.
110
110
ISB2
CMOS Standby Current
(CMOS Inputs)
VDD = MAX,
CS# ≥ VDD - 0.2V
VIN ≥ VDD - 0.2V , or VIN ≤ 0.2V
, f = 0
Com.
50
50
mA
Ind.
60
60
Auto.
100
100
Typ. (2)
10
Notes:
1. At f = fMAX, address and data inputs are cycling at the maximum frequency, f = 0 means no input line change.
2. Typical values are measured at VDD = 3.0V/1.8V, TA = 25 °C and not 100% tested.
IS61/64WV204816ALL
IS61/64WV204816BLL
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Rev. A
10/27/2016
AC CHARACTERISTICS
(OVER OPERATING RANGE)
READ CYCLE AC CHARACTERISTICS
Parameter
Symbol
-10(1)
-12(1)
unit
notes
Min
Min
Min
Max
Read Cycle Time
tRC
10
-
12
-
ns
Address Access Time
tAA
-
10
-
12
ns
Output Hold Time
tOHA
2.5
-
2.5
-
ns
CS# Access Time
tACE
-
10
-
12
ns
OE# Access Time
tDOE
-
6
-
7
ns
OE# to High-Z Output
tHZOE
0
5
0
6
ns
2
OE# to Low-Z Output
tLZOE
0
-
0
-
ns
2
CS# to High-Z Output
tHZCE
0
5
0
6
ns
2
CS# to Low-Z Output
tLZCE
3
-
3
-
ns
2
UB#, LB# Access Time
tBA
-
6
-
7
ns
UB#, LB# to High-Z Output
tHZB
0
5
0
6
ns
2
UB#, LB# to Low-Z Output
tLZB
0
-
0
-
ns
2
Notes:
1. Test conditions assume signal transition times of 1.5 ns or less, timing reference levels of VDD/2, input pulse levels of 0V to VDD and output
loading specified in Figure 1.
2. Tested with the load in Figure 2. Transition is measured ±500 mV from steady-state voltage. Not 100% tested.
IS61/64WV204816ALL
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Rev. A
10/27/2016
AC WAVEFORMS
READ CYCLE NO. 1(1) (Address Controlled, CS# = OE# = UB# = LB# = LOW, WE# = HIGH)
tRC
Address
DQ 0-15
tOHA tOHA
tAA
PREVIOUS DATA VALID DATA VALID
Note:
1. The device is continuously selected.
READ CYCLE NO. 2(1) (OE# CONTROLLED, WE# = HIGH)
OE#
CS#
DOUT
tAA
ADDRESS
tRC
tOHA
tDOE
tLZOE
tACS
tLZCS
tHZOE
tHZCS
HIGH-Z DATA VALID
tLZB tHZB
tBA
UB#,LB#
LOW-Z
Note:
1. Address is valid prior to or coincident with CS# LOW transition.
IS61/64WV204816ALL
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Rev. A
10/27/2016
WRITE CYCLE AC CHARACTERISTICS
Parameter
Symbol
-10(1)
-12(1)
unit
notes
Min
Max
Min
Max
Write Cycle Time
tWC
10
-
12
-
ns
CS# to Write End
tSCS
8
-
9
-
ns
Address Setup Time to Write End
tAW
8
-
9
-
ns
UB#,LB# to Write End
tPWB
8
-
9
-
ns
Address Hold from Write End
tHA
0
-
0
-
ns
Address Setup Time
tSA
0
-
0
-
ns
WE# Pulse Width
tPWE1
8
-
9
-
ns
WE# Pulse Width (OE# = LOW)
tPWE2
10
-
12
-
ns
2
Data Setup to Write End
tSD
6
-
7
-
ns
Data Hold from Write End
tHD
0
-
0
-
ns
WE# LOW to High-Z Output
tHZWE
-
4
-
5
ns
WE# HIGH to Low-Z Output
tLZWE
2
-
2
-
ns
Notes:
1 The internal write time is defined by the overlap of CS# = LOW, UB# or LB# = LOW, and WE# = LOW. All conditions must be in valid states
to initiate a Write, but any condition can go inactive to terminate the Write. The Data Input Setup and Hold timing are referenced to the
rising or falling edge of the signal that terminates the write.
2 Tested tPWE > tHZWE + tSD when OE# is LOW.
AC WAVEFORMS
WRITE CYCLE NO. 1 (CS# CONTROLLED, OE# = HIGH OR LOW)
ADDRESS
CS#
WE#
UB#,LB#
DOUT
DIN
tWC
tHA
tAW tPWE
tPWB
tSA
tHZWE tLZWE
tSD tHD
DATA IN VALID
DATA UNDEFINED HIGH-Z
DATA UNDEFINED
tSCS
(1)
(2)
Note:
1. tHZWE is is based on the assumption when tSA=0nS after READ operation. Actual DOUT for tHZWE may not appear if OE# goes high before
Write Cycle.
IS61/64WV204816ALL
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Rev. A
10/27/2016
WRITE CYCLE NO. 2(1,2) (WE# CONTROLLED: OE# IS HIGH DURING WRITE CYCLE)
ADDRESS
CS#
WE#
UB#,LB#
DOUT
DIN
tWC
tHA
tAW tPWE
tPWB
tSA
tHZOE
tSD tHD
DATA IN VALID
DATA UNDEFINED HIGH-Z
DATA UNDEFINED
tSCS
(1)
(2)
OE#
Notes:
1. tHZOE is the time DOUT goes to High-Z after OE# goes high.
2. During this period the I/Os are in output state. Do not apply input signals.
WRITE CYCLE NO. 3(1) (WE# CONTROLLED: OE# IS LOW DURING WRITE CYCLE)
tWC
tHA
tAW
tPWE2
tSA
tHZWE tLZWE
HIGHZ
tSD tHD
DATA UNDEFINED
DATA IN VALID
ADDRESS
CS#=LOW
WE#
DOUT
DIN
OE# = LOW
tPWB
UB#,LB#
Note:
1. If OE# is low during write cycle, tHZWE must be met in the application. Do not apply input signal during this period. Data output from the
previous READ operation will drive IO BUS.
IS61/64WV204816ALL
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Rev. A
10/27/2016
WRITE CYCLE NO. 4(1, 2, 3) (UB# & LB# Controlled, CS# = OE# = LOW)
ADDRESS
WE#
DOUT
DIN
tSA
tHZWE
tPWB
tHA
DATA IN
VALID
ADDRESS 1 ADDRESS 2
tWC
DATA IN
VALID
DATA UNDEFINED tHD
tSD
HIGH-Z tLZWE
WORD 1 WORD 2
UB#, LB#
tHA
OE#=LOW
CS#=LOW
tSA
tPWB
tWC
Notes:
1. If OE# is low during write cycle, tHZWE must be met in the application. Do not apply input signal during this period. Data output from the
previous READ operation will drive IO BUS.
2. Due to the restriction of note1, OE# is recommended to be HIGH during write period.
3. WE# stays LOW in this example. If WE# toggles,, tPWE and tHZWE must be considered.
IS61/64WV204816ALL
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Integrated Silicon Solution, Inc.- www.issi.com 13
Rev. A
10/27/2016
DATA RETENTION CHARACTERISTICS
Symbol
Parameter
Test Condition
OPTION
Min.
Typ.(2)
Max.
Unit
VDR
VDD for Data
Retention
See Data Retention Waveform
VDD = 2.4V to 3.6V
2.0
3.6
V
VDD = 1.65V to 2.2V
1.2
3.6
IDR
Data Retention
Current
VDD= VDR(min),
CS# ≥ VDD – 0.2V
Com.
-
10
50
mA
Ind.
-
-
60
Auto
-
-
100
tSDR
Data Retention
Setup Time
See Data Retention Waveform
0
-
-
ns
tRDR
Recovery Time
See Data Retention Waveform
tRC
-
-
ns
Notes:
1. If CS# > VDD–0.2V, all other inputs including UB# and LB# must meet this condition.
2. Typical values are measured at VDD = VDR (Min), TA = 25 °C and not 100% tested.
DATA RETENTION WAVEFORM (CS# CONTROLLED)
GND
CS#
VDR
VDD
CS# > VDD – 0.2V
Data Retention Mode
tSDR tRDR
IS61/64WV204816ALL
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Rev. A
10/27/2016
ORDERING INFORMATION
IS61/64WV204816ALL (1.65V – 2.2V)
Commercial Range: 0°C to +70°C
Speed (ns)
Order Part No.
Package
10
IS61WV204816ALL-10B
mini BGA (6mm x 8mm)
10
IS61WV204816ALL-10BL
mini BGA (6mm x 8mm), Lead-free
10
IS61WV204816ALL-10T
TSOP (Type I)
10
IS61WV204816ALL-10TL
TSOP (Type I), Lead-free
Industrial Range: -40°C to +85°C
Speed (ns)
Order Part No.
Package
10
IS61WV204816ALL-10BI
mini BGA (6mm x 8mm)
10
IS61WV204816ALL-10BLI
mini BGA (6mm x 8mm), Lead-free
10
IS61WV204816ALL-10TII
TSOP (Type I)
10
IS61WV204816ALL-10TLI
TSOP (Type I), Lead-free
Automotive (A3) Range: –40°C to +125°C
Speed (ns)
Order Part No.
Package
12
IS64WV204816ALL-12BA3
mini BGA (6mm x 8mm)
12
IS64WV204816ALL-12BLA3
mini BGA (6mm x 8mm), Lead-free
12
IS64WV204816ALL-12CTLA3
TSOP (Type I), Copper Lead-frame, Lead-free
IS61/64WV204816ALL
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Rev. A
10/27/2016
IS61/64WV204816BLL (2.2V - 3.6V)
Commercial Range: 0°C to +70°C
Speed (ns)
Order Part No.
Package
10
IS61WV204816BLL-10B
mini BGA (6mm x 8mm)
10
IS61WV204816BLL-10BL
mini BGA (6mm x 8mm), Lead-free
10
IS61WV204816BLL-10T
TSOP (Type I)
10
IS61WV204816BLL-10TL
TSOP (Type I), Lead-free
Industrial Range: -40°C to +85°C
Speed (ns)
Order Part No.
Package
10
IS61WV204816BLL-10BI
mini BGA (6mm x 8mm)
10
IS61WV204816BLL-10BLI
mini BGA (6mm x 8mm), Lead-free
10
IS61WV204816BLL-10TI
TSOP (Type I)
10
IS61WV204816BLL-10TLI
TSOP (Type I), Lead-free
Automotive (A3) Range: –40°C to +125°C
Speed (ns)
Order Part No.
Package
12
IS64WV204816BLL-12BA3
mini BGA (6mm x 8mm)
12
IS64WV204816BLL-12BLA3
mini BGA (6mm x 8mm), Lead-free
12
IS64WV204816BLL-12CTLA3
TSOP (Type I), Copper Lead-frame, Lead-free
