Datasheet
SN74ABTE16245
16-BIT INCIDENT-WAVE SWITCHING BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCBS226H – JULY 1993 – REVISED JUNE 2001
4–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D Member of Texas Instruments’ Widebus
Family
D Supports the VME64 ETL Specification
D Reduced, TTL-Compatible, Input Threshold
Range
D High-Drive Outputs (I
OH
= –60 mA,
I
OL
= 90 mA) Support 25-Ω Incident-Wave
Switching
D V
CC
BIAS Pin Minimizes Signal Distortion
During Live Insertion
D Internal Pullup Resistor on OE Keeps
Outputs in High-Impedance State During
Power Up or Power Down
D Distributed V
CC
and GND Pins Minimize
High-Speed Switching Noise
D Equivalent 25-Ω Series Damping Resistor
on B Port
D Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
description
The SN74ABTE16245 is a 16-bit (dual-octal)
noninverting 3-state transceiver designed for
synchronous two-way communication between
data buses. The control-function implementation
minimizes external timing requirements. This
device can be used as two 8-bit transceivers or
one 16-bit transceiver. The device allows data transmission from the A bus to the B bus or from the B bus to
the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE
) input can
be used to disable the device so that the buses are effectively isolated. When OE is low, the device is active.
The B port has an equivalent 25-Ω series output resistor to reduce ringing. Active bus-hold inputs are also on
the B port to hold unused or floating inputs at a valid logic level.
The A port provides for the precharging of the outputs via V
CC
BIAS, which establishes a voltage between 1.3 V
and 1.7 V when V
CC
is not connected.
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors
with the bus-hold circuitry is not recommended.
Copyright 2001, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Widebus is a trademark of Texas Instruments.
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1DIR
1B1
2B1
GND
1B2
2B2
V
CC
1B3
2B3
GND
1B4
2B4
1B5
2B5
GND
1B6
2B6
V
CC
1B7
2B7
GND
1B8
2B8
2DIR
V
CC
BIAS
1A1
2A1
GND
1A2
2A2
V
CC
1A3
2A3
GND
1A4
2A4
1A5
2A5
GND
1A6
2A6
V
CC
1A7
2A7
GND
1A8
2A8
OE