Philips Semiconductors Product specification
74ALVCH1660118-bit universal bus transceiver (3-State)
2
1998 Sep 24 853-2122 20076
FEATURES
•Complies with JEDEC standard no. 8-1A
•CMOS low power consumption
•Direct interface with TTL levels
•MULTIBYTETM flow-through standard pin-out architecture
•Low inductance multiple VCC and ground pins for minimum noise
and ground bounce
•Current drive ± 24 mA at 3.0 V
•All inputs have bus hold circuitry
•Output drive capability 50Ω transmission lines @ 85°C
DESCRIPTION
The 74ALVCH16601 is an 18-bit universal transceiver featuring
non-inverting 3-State bus compatible outputs in both send and
receive directions. Data flow in each direction is controlled by output
enable (OEAB and OEBA), latch enable (LEAB and LEBA), and clock
(CPAB and CPBA) 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 CPAB is held at a High or Low logic level. If LEAB
is Low, the A-bus data is stored in the latch/flip-flop on the
Low-to-High transition of CPAB. When OEAB is Low, the outputs are
active. When OEAB is High, the outputs are in the high-impedance
state. The clocks can be controlled with the clock-enable inputs
(CEBA/CEAB).
Data flow for B-to-A is similar to that of A-to-B but uses OEBA, LEBA
and CPBA.
To ensure the high impedance state during power up or power
down, OEBA and OEAB should be tied to VCC through a pullup
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.
QUICK REFERENCE DATA
GND = 0V ; Tamb = 25°C; tr = tf = 2.5 ns
SYMBOL PARAMETER CONDITIONS TYPICAL UNIT
tPHL/tPLH Propagation delay
An, Bn to Bn, An VCC = 2.5V, CL = 30pF
VCC = 3.3V, CL = 50pF 3.1
2.8 ns
CI/O Input/Output capacitance 8.0 pF
CIInput capacitance 4.0 pF
p
p
p
Outputs enabled 21 p
PD
w
I =
CC
Outputs disabled 3
NOTES:
1. CPD is used to determine the dynamic power dissipation (PD in W):
PD = CPD × VCC2 × fi + (CL × VCC2 × fo) where:
fi = input frequency in MHz; CL = output load capacity in pF;
fo = output frequency in MHz; VCC = supply voltage in V ;
(CL × VCC2 × fo) = sum of outputs.
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA DWG NUMBER
56-Pin Plastic TSSOP Type II –40°C to +85°C74ALVCH16601 DGG SOT364-1