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74ABT657

Selection guide

Datasheet

74ABT657
(Product Specification)
27-Oct-04, 14 pages, 139 kB

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74ABT657 - Octal transceiver with parity generator/checker (3-state)

General description
Features
Products/packages
Quality/reliability/chemical content
Pricing/ordering/availability
Samples
Discontinued information
Applications
Block diagrams/pinning
Design support
Parametrics/similar products
Print/email
Disclaimers
All information hereunder is subject to the subsequent disclaimers

General description

The 74ABT657 high-performance BiCMOS device combines low static and dynamic power dissipation with high speed and high output drive.

The 74ABT657 is an octal transceiver featuring non-inverting buffers with 3-State outputs and an 8-bit parity generator/checker, and is intended for bus-oriented applications. The buffers have a guaranteed current sinking capability of 64 mA. The Transmit/Receive (T/R) input determines the direction of the data flow through the bidirectional transceivers. Transmit (active-HIGH) enables data from A ports to B ports; Receive (active-LOW) enables data from B ports to A ports.

The Output Enable (OE) input disables both the A and B ports by placing them in a high-impedance condition when the OE input is HIGH. The parity select (ODD/EVEN) input gives the user the option of odd or even parity systems. The parity (PARITY) pin is an output from the generator/checker when transmitting from the port A to B (T/R = HIGH) and an input when receiving from port B to A port (T/R = Low). When transmitting (T/R = HIGH) the parity select (ODD/EVEN) input is set, then the A port data is polled to determine the number of HIGH bits. The parity (PARITY) output then goes to the logic state determined by the parity select (ODD/EVEN) setting and by the number of HIGH bits on port A. For example, if the parity select (ODD/EVEN) is set LOW (even parity), and the number of HIGH bits on port A is odd, then the parity (PARITY) output will be HIGH, transmitting even parity. If the number of HIGH bits on port A is even, then the parity (PARITY) output will be LOW, keeping even parity. When in receive mode (T/R = LOW) the B port is polled to determine the number of HIGH bits. If parity select (ODD/EVEN) is LOW (even parity) and the number of HIGHs on port B is:

      (1) odd and the parity (PARITY) input is HIGH, then ERROR will be HIGH, signifying no error.
      (2) even and the parity (PARITY) input is HIGH, then ERROR will be asserted LOW, indicating an error.

Features

  • Combinational functions in one package
  • Low static and dynamic power dissipation with high speed and high output drive
  • Output capability: +64 mA/-32 mA
  • Power-up 3-State
  • Latch-up protection exceeds 500 mA per JEDEC Std 17
  • ESD protection exceeds 2000 V per MIL STD 883 Method 3015 and 200 V per Machine Model

Products/packages

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarkingECCN
74ABT657D74ABT657D,6029350 452 90602Volume productionSOT137Tube (Signetics)Standard Marking
74ABT657D74ABT657D,6239350 452 90623Volume productionSOT137Reel Pack, SMD, 13" (Signetics)Standard Marking
74ABT657DB74ABT657DB,1129350 691 80112Volume productionSOT340-1
(SSOP24)
TubeStandard Marking
74ABT657DB74ABT657DB,1189350 691 80118Volume productionSOT340-1
(SSOP24)
Reel Pack, SMD, 13"Standard Marking
74ABT657PW74ABT657PW,1129351 789 00112Volume productionSOT355-1
(TSSOP24)
TubeStandard Marking
74ABT657PW74ABT657PW,1189351 789 00118Volume productionSOT355-1
(TSSOP24)
Reel Pack, SMD, 13"Standard Marking

Quality/reliability/chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree Conversion dateRHFIRF (FIT)MTBF (hours)MSL
74ABT657D74ABT657D,60274ABT657D
week 13, 2005 1,337,52E+081
74ABT657D74ABT657D,62374ABT657D
week 13, 2005 1,337,52E+081
74ABT657DB74ABT657DB,11274ABT657DB
week 12, 2005 1,337,52E+081
74ABT657DB74ABT657DB,11874ABT657DB
week 12, 2005 1,337,52E+081
74ABT657PW74ABT657PW,11274ABT657PW
week 10, 2005 1,337,52E+081
74ABT657PW74ABT657PW,11874ABT657PW
week 10, 2005 1,337,52E+081

Quality and reliability disclaimer

Pricing/ordering/availability

Type numberOrdering code(12NC)Orderable part numberIndicative price/unit($)RegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
74ABT657D9350 452 90602  74ABT657D,602  1.4900      not available
74ABT657D9350 452 90623  74ABT657D,623  1.4900      not available
74ABT657DB9350 691 80112  74ABT657DB,112  1.4900      not available
74ABT657DB9350 691 80118  74ABT657DB,118  1.4900      not available
74ABT657PW9351 789 00112  74ABT657PW,112  1.3000NAFUTURE ELECTRONICS1,575 11/19/2009Buy onlinenot available
74ABT657PW9351 789 00118  74ABT657PW,118  1.3000      not available

Block diagrams/pinning

Parametrics/similar products

Type numberPackageDescriptionPropagation Delay(ns)VoltageLogic Switching LevelsOutput Drive Capability
74ABT657DSOT137
Octal Transceiver with Parity Generator/Checker; Non-Inverting (3-State)3.34.5-5.5 VTTL-32/+64 mA
74ABT657DBSOT340-1
(SSOP24)
Octal Transceiver with Parity Generator/Checker; Non-Inverting (3-State)3.34.5-5.5 VTTL-32/+64 mA
74ABT657PWSOT355-1
(TSSOP24)
Octal Transceiver with Parity Generator/Checker; Non-Inverting (3-State)3.34.5-5.5 VTTL-32/+64 mA


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74ABT657 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.