SN74ALVCH16269_07 Datasheet, PDF (1/16 Pages) Texas Instruments – 12-BIT TO 24-BIT REGISTERED BUS EXCHANGER WITH 3-STATE OUTPUTS

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FEATURES
• Member of the Texas Instruments Widebus™
Family
• Operates From 1.65 V to 3.6 V
• Max t_pd of 5 ns at 3.3 V
• ±24-mA Output Drive at 3.3 V
• Bus Hold on Data Inputs Eliminates the Need
for External Pullup/Pulldown Resistors
• Latch-Up Performance Exceeds 250 mA Per
JESD 17
• ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
DESCRIPTION/ORDERING INFORMATION
This 12-bit to 24-bit registered bus exchanger is
designed for 1.65-V to 3.6-V V_CC operation.
The SN74ALVCH16269 is used in applications in
which two separate ports must be multiplexed onto,
or demultiplexed from, a single port. The device is
particularly suitable as an interface between
synchronous
DRAMs
and
high-speed
microprocessors.
Data is stored in the internal B-port registers on the
low-to-high transition of the clock (CLK) input when
the appropriate clock-enable (CLKENA) inputs are
low. Proper control of these inputs allows two
sequential 12-bit words to be presented as a 24-bit
word on the B port. For data transfer in the B-to-A
direction, a single storage register is provided. The
select (SEL) line selects 1B or 2B data for the A
outputs. The register on the A output permits the
fastest possible data transfer, extending the period
during which the data is valid on the bus. The control
terminals are registered so that all transactions are
synchronous with CLK. Data flow is controlled by the
active-low output enables (OEA, OEB1, OEB2).
SN74ALVCH16269
12-BIT TO 24-BIT REGISTERED BUS EXCHANGER
WITH 3-STATE OUTPUTS
SCES019N – JULY 1995 – REVISED JULY 2004
DGG OR DL PACKAGE
(TOP VIEW)
OEA 1
OEB1 2
2B3 3
GND 4
2B2 5
2B1 6
V_CC 7
A1 8
A2 9
A3 10
GND 11
A4 12
A5 13
A6 14
A7 15
A8 16
A9 17
GND 18
A10 19
A11 20
A12 21
V_CC 22
1B1 23
1B2 24
GND 25
1B3 26
NC 27
SEL 28
56 _OEB2
55 _CLKENA2
54 _2B4
53 _GND
52 _2B5
51 _2B6
50 _VCC
49 _2B7
48 _2B8
47 _2B9
46 _GND
45 _2B10
44 _2B11
43 _2B12
42 _1B12
41 _1B11
40 _1B10
39 _GND
38 _1B9
37 _1B8
36 _1B7
35 _VCC
34 _1B6
33 _1B5
32 _GND
31 _1B4
30 _CLKENA1
29 _CLK
NC − No internal connection
T_A
-40°C to 85°C
ORDERING INFORMATION
PACKAGE ⁽¹⁾
ORDERABLE PART NUMBER
SSOP - DL
Tube
Tape and reel
SN74ALVCH16269DL
SN74ALVCH16269DLR
TSSOP - DGG
Tape and reel
SN74ALVCH16269DGGR
VFBGA - GQL
VFBGA - ZQL (Pb-free)
Tape and reel
SN74ALVCH16269KR
74ALVCH16269ZQLR
TOP-SIDE MARKING
ALVCH16269
ALVCH16269
VH269
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
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 is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1995–2004, Texas Instruments Incorporated