Datasheet
SN74GTL1655
16-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVER
WITH LIVE INSERTION
SCBS696G – JULY 1997 – REVISED AUGUST 2001
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D Member of Texas Instruments’ Widebus
Family
D UBT Transceiver Combines D-Type
Latches and D-Type Flip-Flops for
Operation in Transparent, Latched, or
Clocked Modes
D OEC Circuitry Improves Signal Integrity
and Reduces Electromagnetic Interference
D Translates Between GTL/GTL+ Signal Level
and LVTTL Logic Levels
D High-Drive (100 mA),
Low-Output-Impedance (12 Ω) Bus
Transceiver (B Port)
D Edge-Rate-Control Input Configures the
B-Port Output Rise and Fall Times
D I
off
, Power-Up 3-State, and BIAS V
CC
Support Live Insertion
D Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors on A Port
D Distributed V
CC
and GND Pins Minimize
High-Speed Switching Noise
description
The SN74GTL1655 is a high-drive (100 mA),
low-output-impedance (12 Ω) 16-bit UBT
transceiver that provides LVTTL-to-GTL/GTL+
and GTL/GTL+-to-LVTTL signal-level translation.
This device is partitioned as two 8-bit transceivers
and combines D-type flip-flops and D-type latches
to allow for transparent, latched, and clocked
modes of data transfer similar to the ’16501
function. This device provides an interface
between cards operating at LVTTL logic levels
and a backplane operating at GTL/GTL+ signal
levels. Higher-speed operation is a direct result of
the reduced output swing (<1 V), reduced input
threshold levels, and OEC circuitry. The high
drive is suitable for driving double-terminated
low-impedance backplanes using incident-wave
switching.
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.
OEC, UBT, and Widebus are trademarks of Texas Instruments.
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1OEAB
1OEBA
V
CC
1A1
GND
1A2
1A3
GND
1A4
GND
1A5
GND
1A6
1A7
V
CC
1A8
2A1
GND
2A2
2A3
GND
2A4
2A5
GND
2A6
GND
2A7
V
CC
2A8
GND
2OEAB
2OEBA
CLK
1LEAB
1LEBA
V
ERC
GND
1B1
1B2
GND
1B3
1B4
1B5
GND
1B6
1B7
V
CC
1B8
2B1
GND
2B2
2B3
GND
2B4
2B5
V
REF
2B6
GND
2B7
2B8
BIAS V
CC
2LEAB
2LEBA
OE