Philips Semiconductors Product specification
74F651A/74F652ATransceivers/registers
74F651A Octal transceiver/register, inverting (3-State)
74F652A Octal transceiver/register, non-inverting (3-State)
2
1999 Jun 23 853–1126 21852
FEATURES
• Combines 74F245 and two 74F374 type functions in one chip
• High impedance base inputs for reduced loading (70µA in high
and low states)
• Independent registers for A and B buses
• Multiplexed real-time and stored data
• Choice of non-inverting and inverting data paths
• 3-State outputs
• Industrial temperature range available (–40°C to +85°C) for
74F652A
DESCRIPTION
The 74F651A and 74F652A transceivers/registers consist of bus
transceiver circuits with 3–State outputs, D–type flip–flops, and
control circuitry arranged for multiplexed transmission of data
directly from the input bus or the internal registers. Data on the A or
B bus will be clocked into the registers as the appropriate clock pin
goes high. Output enable (OEAB, OEBA
) and select (SAB, SBA)
pins are provided for bus management.
TYPE
TYPICAL f
max
TYPICAL SUPPLY CURRENT( TOTAL)
74F651/74F652 110MHz 140mA
74F651A/74F652A 175MHz 110mA
ORDERING INFORMATION
ORDER CODE
COMMERCIAL RANGE INDUSTRIAL RANGE
V
CC
= 5V ±10%, V
CC
= 5V ±10%,
T
amb
= 0°C to +70°C T
amb
= –40°C to +85°C
24–pin plastic slim DIP (300mil) N74F651AN, N74F652AN I74F652AN SOT222-1
24–pin plastic SOL N74F651AD, N74F652AD I74F652AD SOT137-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW
A0 – A7, B0 – B7 A, B inputs 3.5/0.116 70µA/70µA
CPAB, CPBA A–to–B, B–to–A clock inputs 1.0/0.033 20µA/20µA
SAB, SBA A–to–B, B–to–A select inputs 1.0/0.033 20µA/20µA
OEAB, OEBA A–to–B, B–to–A output enable inputs 1.0/0.033 20µA/20µA
A0 – A7, B0 – B7 A, B outputs for N74F651, N74F652 750/106.7 15mA/64mA
A0 – A7, B0 – B7 A, B outputs for N74F651A, N74F652A 750/80 15mA/48mA
A0 – A7, B0 – B7 A, B outputs for I74F652A 750/60 15mA/36mA
Note to input and output loading and fan out table
1. One (1.0) FAST unit load is defined as: 20µA in the high state and 0.6mA in the low state.
