SN54GTL16622A, SN74GTL16622A
18-BIT LVTTL-TO-GTL/GTL+ BUS TRANSCEIVERS
SCBS673D – AUGUST 1996 – REVISED DECEMBER 1999
SN74GTL16622A . . . DGG PACKAGE
(TOP VIEW)
Members of the Texas Instruments
Widebus Family
D-Type Flip-Flops With Qualified Storage
Enable
OEAB
1A1
GND
1A2
1A3
GND
CLKAB
1CEAB
1CEBA
1B1
GND
1B2
1
64
63
62
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34
33
2
Translate Between GTL/GTL+ Signal Levels
and LVTTL Logic Levels
3
4
Support Mixed-Mode (3.3 V and 5 V) Signal
Operation on A-Port and Control Inputs
5
6
I
Supports Partial-Power-Down Mode
V
1B3
7
CC
off
Operation
1A4
GND
1A5
1A6
GND
1A7
1A8
GND
1A9
2A1
GND
2A2
2A3
GND
2A4
2A5
GND
2A6
V
8
CC
1B4
1B5
1B6
GND
1B7
1B8
GND
1B9
2B1
GND
2B2
2B3
GND
2B4
2B5
2B6
9
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors on A Port
10
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ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
Latch-Up Performance Exceeds 250 mA Per
JESD 17
Distributed V
Minimizes High-Speed Noise
and GND-Pin Configuration
CC
Package Options Include Plastic Thin
Shrink Small-Outline (DGG) and Ceramic
Quad Flat (HV) Packages
V
description
REF
V
2B7
2B8
GND
2B9
2CEBA
2CEAB
CLKBA
CC
The
’GTL16622A
devices
are
18-bit
GND
2A7
2A8
GND
2A9
registered bus transceivers that provide
LVTTL-to-GTL/GTL+ and GTL/GTL+-to-LVTTL
signal-level translation. They are partitioned as
two separate 9-bit transceivers with individual
clock-enable controls and contain D-type
flip-flops for temporary storage of data flowing in
either direction. 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 ).
OEBA
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
is the reference input voltage for the B port.
REF
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.
OEC and Widebus 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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