SN54GTL16616, SN74GTL16616
17-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVERS
WITH BUFFERED CLOCK OUTPUTS
SCBS481F – JUNE 1994 – REVISED NOVEMBER 1999
SN54GTL16616 . . . WD PACKAGE
SN74GTL16616 . . . DGG OR DL PACKAGE
(TOP VIEW)
Members of the Texas Instruments
Widebus Family
Universal Bus Transceiver (UBT
)
Combines D-Type Latches and D-Type
Flip-Flops for Operation in Transparent,
Latched, Clocked, or Clock-Enabled Mode
OEAB
LEAB
A1
GND
A2
A3
(3.3 V)
A4
CEAB
CLKAB
B1
GND
B2
1
2
3
4
5
6
7
8
9
56
55
54
53
52
51
50
49
48
GTL Buffered CLKAB Signal (CLKOUT)
Translate Between GTL/GTL+ Signal Levels
and LVTTL Logic Levels
B3
V
V
(5 V)
CC
CC
Support Mixed-Mode (3.3 V and 5 V) Signal
Operation on A-Port and Control Inputs
B4
B5
A5
Equivalent to ’16601 Function
A6 10
47 B6
I
Supports Partial-Power-Down Mode
off
GND
A7
GND
B7
11
12
46
45
Operation
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors on A Port
A8 13
A9 14
44 B8
43 B9
A10 15
A11 16
42 B10
41 B11
40 B12
39 GND
38 B13
37 B14
36 B15
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
A12 17
GND 18
A13 19
A14 20
A15 21
(3.3 V) 22
A16 23
A17 24
GND 25
CLKIN 26
OEBA 27
LEBA 28
Distributed V
Minimizes High-Speed Switching Noise
and GND-Pin Configuration
CC
Package Options Include Plastic Shrink
Small-Outline (DL), Thin Shrink
Small-Outline (DGG), and Ceramic Flat
(WD) Packages
V
35
V
CC
REF
34 B16
33 B17
32 GND
31 CLKOUT
30 CLKBA
29 CEBA
description
The ’GTL16616 devices are 17-bit universal
bus transceivers (UBTs) that provide
LVTTL-to-GTL/GTL+ and GTL/GTL+-to-LVTTL
signal-level translation. They combine D-type
flip-flops and D-type latches to allow for transparent, latched, clocked, and clocked-enabled modes of data
transfer identical to the ’16601 function. Additionally, they provide for a copy of CLKAB at GTL/GTL+ signal
levels (CLKOUT) and conversion of a GTL/GTL+ clock to LVTTL logic levels (CLKIN). The 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 user has the flexibility of using this device at either GTL (V = 1.2 V and V
= 0.8 V) or the preferred
TT
REF
higher noise margin GTL+ (V = 1.5 V and V
= 1 V) signal levels. GTL+ is the Texas Instruments derivative
TT
REF
of the Gunning transceiver logic (GTL) JEDEC standard JESD 8-3. The B port normally operates at GTL or
GTL+ signal levels, while the A-port and control inputs are compatible with LVTTL logic levels and are 5-V
tolerant. V
isthereferenceinputvoltagefortheBport. V (5V)suppliestheinternalandGTLcircuitrywhile
REF
CC
V
(3.3 V) supplies the LVTTL output buffers.
CC
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, OEC, and UBT are trademarks of Texas Instruments Incorporated.
Copyright 1999, 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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