SN54GTL1655 Datasheet, PDF (1/16 Pages) Texas Instruments – 16-BIT LVTTL-TO-GTL/GTL UNIVERSAL BUS TRANSCEIVERS WITH LIVE INSERTION

SN54GTL1655, SN74GTL1655
16-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVERS
WITH LIVE INSERTION
SCBS696E – JULY 1997 – REVISED NOVEMBER 1999
D Members of the Texas Instruments
Widebus ™ Family
D UBT ™ (Universal Bus Transceiver)
Combines D-Type Latches and D-Type
Flip-Flops for Operation in Transparent,
Latched, or Clocked Mode
D Translate 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-Pin Configuration
Minimizes High-Speed Switching Noise
D Package Options Include Thin Shrink
Small-Outline (DGG) and Ceramic Quad
Flat (HV) Packages
description
The ’GTL1655 devices are high-drive (100 mA),
low-output-impedance (12 Ω) 16-bit universal bus
transceivers (UBT) that provide LVTTL-to-
GTL/GTL+ and GTL/GTL+-to-LVTTL signal-level
translation. They are partitioned as two 8-bit
transceivers and combine D-type flip-flops and
D-type latches to allow for transparent, latched,
and clocked modes of data transfer similar to the
’16501 function. These devices provide 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 output edge control
(OEC™). The high drive is suitable for driving
double-terminated low-impedance backplanes
using incident-wave switching.
SN74GTL1655 . . . DGG PACKAGE
(TOP VIEW)
1OEAB 1
1OEBA 2
V_CC 3
1A1 4
GND 5
1A2 6
1A3 7
GND 8
1A4 9
GND 10
1A5 11
GND 12
1A6 13
1A7 14
V_CC 15
1A8 16
2A1 17
GND 18
2A2 19
2A3 20
GND 21
2A4 22
2A5 23
GND 24
2A6 25
GND 26
2A7 27
V_CC 28
2A8 ²⁹
GND ³⁰
2OEAB ³¹
2OEBA ³²
64 CLK
63 1LEAB
62 1LEBA
61 V_ERC
60 GND
59 1B1
58 1B2
57 GND
56 1B3
55 1B4
54 1B5
53 GND
52 1B6
51 1B7
50 V_CC
49 1B8
48 2B1
47 GND
46 2B2
45 2B3
44 GND
43 2B4
42 2B5
41 V_REF
40 2B6
39 GND
38 2B7
37 2B8
36 _{BIAS VCC}
35 _2LEAB
34 _2LEBA
33 _OE
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Widebus, UBT, and OEC are trademarks of Texas Instruments Incorporated.
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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.
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Copyright © 1999, Texas Instruments Incorporated
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