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74ABTH182652APMG4 Folha de dados(PDF) 2 Page - Texas Instruments

Nome de Peças 74ABTH182652APMG4
Descrição Electrónicos  SCAN TEST DEVICES WITH 18-BIT BUS TRANSCEIVERS AND REGISTERS
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

74ABTH182652APMG4 Folha de dados(HTML) 2 Page - Texas Instruments

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SN54ABTH18652A, SN54ABTH182652A, SN74ABTH18652A, SN74ABTH182652A
SCAN TEST DEVICES WITH
18BIT BUS TRANSCEIVERS AND REGISTERS
SCBS167D − AUGUST 1993 − REVISED JULY 1996
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
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1A3
1A4
1A5
GND
1A6
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VCC
2A1
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GND
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SN74ABTH18652A, SN74ABTH182652A...PM PACKAGE
(TOP VIEW)
description
The ’ABTH18652A and ’ABTH182652A scan test devices with 18-bit bus transceivers and registers are
members of the Texas Instruments SCOPE
 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.
In the normal mode, these devices are 18-bit bus transceivers and registers that allow for multiplexed
transmission of data directly from the input bus or from the internal registers. They can be used either 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
 bus transceivers and
registers.
Data flow in each direction is controlled by clock (CLKAB and CLKBA), select (SAB and SBA), and
output-enable (OEAB and OEBA) inputs. For A-to-B data flow, data on the A bus is clocked into the associated
registers on the low-to-high transition of CLKAB. When SAB is low, real-time A data is selected for presentation
to the B bus (transparent mode). When SAB is high, stored A data is selected for presentation to the B bus
(registered mode). When OEAB is high, the B outputs are active. When OEAB is low, the B outputs are in the
high-impedance state. Control for B-to-A data flow is similar to that for A-to-B data flow, but uses CLKBA, SBA,
and OEBA inputs. Since the OEBA input is active-low, the A outputs are active when OEBA is low and are in
the high-impedance state when OEBA is high. Figure 1 illustrates the four fundamental bus-management
functions that are performed with the ’ABTH18652A and ’ABTH182652A.


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