CY74FCT646T Octal Registered Bus Transceivers with 3-State Outputs | TI.com

CY74FCT646T (ACTIVE)

Octal Registered Bus Transceivers with 3-State Outputs

 

Description

The \x92FCT646T devices consist of a bus transceiver circuit with 3-state, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers. Data on the A or B bus is clocked into the registers as the appropriate clock pin goes to a high logic level. Output-enable (G\) and direction (DIR) inputs control the transceiver function. In the transceiver mode,data present at the high-impedance port can be stored in either the A or B register, or in both. Select controls (SAB, SBA) can multiplex stored and real-time (transparent mode) data. DIR determines which bus receives data when G\ is low. In the isolation mode (G\ is high), A data can be stored in the B register and/or B data can be stored in the A register.

These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

Features

  • Function, Pinout, and Drive Compatible With FCT and F Logic
  • Reduced VOH (Typically = 3.3 V) Versions of Equivalent FCT Functions
  • Edge-Rate Control Circuitry for Significantly Improved Noise Characteristics
  • Ioff Supports Partial-Power-Down Mode Operation
  • Matched Rise and Fall Times
  • Fully Compatible With TTL Input and Output Logic Levels
  • ESD Protection Exceeds JESD 22
    • 2000-V Human-Body Model (A114-A)
    • 200-V Machine Model (A115-A)
    • 1000-V Charged-Device Model (C101)
  • Independent Register for A and B Buses
  • CY54FCT646T
    • 48-mA Output Sink Current
    • 12-mA Output Source Current
  • CY74FCT646T
    • 64-mA Output Sink Current
    • 32-mA Output Source Current
  • 3-State Outputs

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Parametrics Compare all products in Registered transceiver

 
Technology Family
VCC (Min) (V)
VCC (Max) (V)
Bits (#)
Voltage (Nom) (V)
F @ nom voltage (Max) (Mhz)
ICC @ nom voltage (Max) (mA)
tpd @ Nom Voltage (Max) (ns)
IOL (Max) (mA)
IOH (Max) (mA)
Operating temperature range (C)
Package Group
CY74FCT646AT CY74FCT646CT CY74FCT646T CY54FCT646T
FCT     FCT     FCT     FCT    
4.75     4.75     4.75     4.75    
5.25     5.25     5.25     5.25    
8     8     8     8    
5     5     5     5    
70     70     70     70    
0.2     0.2     0.2     0.2    
6.3     5.4     9     9    
64     64     64     64    
-32     -32     -32     -32    
-40 to 85     -40 to 85     -40 to 85     -55 to 125    
SOIC | 24
SSOP | 24    
SOIC | 24     SOIC | 24     LCCC | 28