1PS8155A 11/06/00
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PI74ALVCH16500
18-Bit Universal Bus Transceiver
With 3-State Outputs
Logic Block Diagram
Product Description
Pericom Semiconductors PI74ALVCH series of logic circuits are
produced using the Companys advanced 0.5 micron CMOS
technology, achieving industry leading speed.
The 18-bit PI74ALVCH16500 univeral bus transceiver is designed
for 2.3V to 3.6V Vcc operation.
Data flow in each direction is controlled by Output Enable (OEAB
and OEBA), Latch- Enable (LEAB and LEBA), and clock (CLKAB
and CLKBA) inputs. For A- to-B data flow, the device operates in
the transparent mode when LEAB is high. When LEAB is low, the
A data is latched if CLKAB is held at a high or low logic level. If
LEAB is low, the A data is stored in the latch/flip-flop on the high-
to-low transition of CLKAB. Output-enable OEAB is active high.
When OEAB is high, the B-port outputs are active. When OEAB is
low, the B-port outputs are in the high-impedence state.
Data flow for B to A is similar to that of A to B but uses OEBA,
LEBA, and CLKBA. The Output Enables are complementary
(OEAB is active HIGH and OEBA is active LOW).
To ensure the high-impedance state during power up or power
down, OEBA should be tied to Vcc through a pull-up resistor and
OEAB should be tied to GND through a pulldown resistor; the
minimum value of the resistor is determined by the current-sinking/
current-sourcing capability of the driver.
Active bus-hold circuitry is provided to hold unused or floating
data inputs at a valid logic level.
Product Features
•PI74ALVCH16500 is designed for low voltage operation
•VCC = 2.3V to 3.6V
•Hysteresis on all inputs
•Typical VOLP (Output Ground Bounce)
< 0.8V at VCC = 3.3V, TA = 25°C
•Typical VOHV (Output VOH Undershoot)
< 2.0V at VCC = 3.3V, TA = 25°C
•Bus Hold retains last active bus state during 3-State
eliminating the need for external pullup resistors
•Industrial operation at 40°C to +85°C
•Packages available:
56-pin 240 mil wide plastic TSSOP (A)
56-pin 300 mil wide plastic SSOP (V)
CLKBA
TO 17 OTHER CHANNELS
OEBA
A1
C1
1D
3
27
30
CLKAB
LEAB
LEBA 28
2
55
OEAB 1
1D
C1
CLK
1D
C1
CLK
B1
54
PI74ALVCH16500
18-Bit Universal Bus Transceiver
2PS8155A 11/06/00
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Pin Name Description
OE Output Enable Input (Active HIGH)
LE Latch Enable (Active HIGH)
CLK Clock Input (Active LOW)
Ax Data I/O
Bx Data I/O
GND Ground
VCC Power
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
25
26
27
28
32
31
30
29
Product Pin Description Truth Table(1)
Note:
1. H = High Signal Level
L = Low Signal Level
Z = High Impedance
↓ = HIGH-to-LOW Transition
Product Pin Configuration
56-Pin
A, V
OEAB
LEAB
A1
GND
A2
A3
VCC
A4
A5
A6
GND
A7
A8
A9
A10
A11
A12
GND
A13
A14
A15
VCC
A16
A17
GND
A18
OEBA
LEBA
GND
CLKAB
B1
GND
B2
B3
VCC
B4
B5
B6
GND
B7
B8
B9
B10
B11
B12
GND
B13
B14
B15
VCC
B16
B17
GND
B18
CLKBA
GND
A-to-B data flow is shown: B-to-A flow is similar but
uses OEBA, LEBA, CLKBA.
Output level before the indicated steady-state input
conditions were established.
stupnI
BtuptuO
BAEOBAELBAKLCA
LXX X Z
HHX L L
HHX H H
HL ¯LL
HL ¯HH
HLL
OR
HX B0
PI74ALVCH16500
18-Bit Universal Bus Transceiver
3PS8155A 11/06/00
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Storage Temperature ......................................................... 65°C to +150°C
Ambient Temperature with Power Applied ........................ 40°C to +85°C
Input Voltage Range, VIN .................................................. 0.5V to VCC +0.5V
Output Voltage Range, VOUT ........................................... 0.5V to VCC +0.5V
DC Input Voltage .................................................................0.5V to +5.0V
DC Output Current ........................................................................... 100 mA
Power Dissipation ................................................................................ 1.0W
Note:
Stresses greater than those listed under MAXI-
MUM 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 condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for ex-
tended periods may affect reliability.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Note:
1. Unused control inputs must be held HIGH or LOW to prevent them from floating.
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Recommended Operating Conditions(1)
PI74ALVCH16500
18-Bit Universal Bus Transceiver
4PS8155A 11/06/00
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DC Electrical Characteristics (Over the Operating Range, TA = 40°C to +85°C, VCC = 3.3V ± 10%)
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Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device typ e.
2. Typical values are at VCC = 3.3V, +25°C ambient and maximum loading.
3. Bus Hold maximum dynamic current required to switch the input from one state to another.
4. For I/O ports, the IOZ includes the input leakage current.
PI74ALVCH16500
18-Bit Universal Bus Transceiver
5PS8155A 11/06/00
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Timing Requirements over Operating Range
Switching Characteristics Over Operating Range(1)
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
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Notes:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
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Notes:
1. See test circuit and waveforms.
2. Unused control inputs must be held HIGH or LOW to prevent them from floating.
Operating Characteristics, TA = 25ºC
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