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5962-9681101QXA Datasheet

  • 5962-9681101QXA

  • 3.3-V ABT SCAN TEST DEVICES WITH 18-BIT UNIVERSAL BUS TRANSC...

  • 38頁

  • TI

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SN54LVTH18502A, SN54LVTH182502A, SN74LVTH18502A, SN74LVTH182502A
3.3 V ABT SCAN TEST DEVICES
WITH 18 BIT UNIVERSAL BUS TRANSCEIVERS
SCBS668C 鈭?JULY 1996 鈭?REVISED JUNE 2004
D
Members of the Texas Instruments
D
D
D
D
D
D
SCOPE
錚?/div>
Family of Testability Products
Members of the Texas Instruments
Widebus
錚?/div>
Family
State-of-the-Art 3.3-V ABT Design Supports
Mixed-Mode Signal Operation (5-V Input
and Output Voltages With 3.3-V V
CC
)
Support Unregulated Battery Operation
Down to 2.7 V
UBT
錚?/div>
(Universal Bus Transceiver)
Combines D-Type Latches and D-Type
Flip-Flops for Operation in Transparent,
Latched, or Clocked Mode
Bus Hold on Data Inputs Eliminates the
Need for External Pullup Resistors
B-Port Outputs of 鈥橪VTH182502A Devices
Have Equivalent 25-鈩?Series Resistors, So
No External Resistors Are Required
D
Compatible With the IEEE Standard
D
1149.1-1990 (JTAG) Test Access Port and
Boundary-Scan Architecture
SCOPE
錚?/div>
Instruction Set
鈭?IEEE Standard 1149.1-1990 Required
Instructions and Optional CLAMP and
HIGHZ
鈭?Parallel-Signature Analysis at Inputs
鈭?Pseudorandom Pattern Generation From
Outputs
鈭?Sample Inputs/Toggle Outputs
鈭?Binary Count From Outputs
鈭?Device Identification
鈭?Even-Parity Opcodes
Packaged in 64-Pin Plastic Thin Quad Flat
(PM) Packages Using 0.5-mm
Center-to-Center Spacings and 68-Pin
Ceramic Quad Flat (HV) Packages Using
25-mil Center-to-Center Spacings
D
description
The 鈥橪VTH18502A and 鈥橪VTH182502A scan test devices with 18-bit universal bus transceivers are members
of the Texas Instruments SCOPE錚?testability integrated-circuit family. This family of devices supports IEEE
Standard 1149.1-1990 boundary scan to facilitate testing of complex circuit-board assemblies. Scan access to
the test circuitry is accomplished via the 4-wire test access port (TAP) interface.
Additionally, these devices are designed specifically for low-voltage (3.3-V) V
CC
operation, but with the
capability to provide a TTL interface to a 5-V system environment.
In the normal mode, these devices are 18-bit universal bus transceivers, that combine with D-type latches and
D-type flip-flops, they allow data to flow in the transparent, latched, or clocked modes. Another use is as two
9-bit transceivers or one 18-bit transceiver. The test circuitry can be activated by the TAP to take snapshot
samples of the data appearing at the device pins or to perform a self test on the boundary-test cells. Activating
the TAP in the normal mode does not affect the functional operation of the SCOPE universal bus transceivers.
Data flow in each direction is controlled by output-enable (OEAB and OEBA), latch-enable (LEAB and LEBA),
and clock (CLKAB and CLKBA) inputs. For A-to-B data flow, the device operates in the transparent mode when
LEAB is high. When LEAB is low, the A-bus data is latched while CLKAB is held at a static low or high logic level.
Otherwise, if LEAB is low, A-bus data is stored on a low-to-high transition of CLKAB. When OEAB is low, the
B outputs are active. When OEAB is high, the B outputs are in the high-impedance state. B-to-A data flow is
similar to A-to-B data flow, but uses the OEBA, LEBA, and CLKBA inputs.
In the test mode, the normal operation of the SCOPE universal bus transceivers is inhibited, and the test circuitry
is enabled to observe and control the I/O boundary of the device. When enabled, the test circuitry performs
boundary-scan test operations according to the protocol described in IEEE Standard 1149.1-1990.
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.
SCOPE, Widebus, and UBT are trademarks of Texas Instruments.
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.
POST OFFICE BOX 655303
Copyright
錚?/div>
2004, Texas Instruments Incorporated
鈥?/div>
DALLAS, TEXAS 75265
1

5962-9681101QXA 產(chǎn)品屬性

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