Philips Semiconductors
IEC/IEEE bus interface
Product specification
HEF4738V
LSI
DESCRIPTION
The HEF4738V is an implementation of the IEC-bus as
described in IEC report 66 CO 22 (interface system for
programmable measuring apparatus) as well as in IEEE
standard 488-1975 (standard digital interface for
programmable instrumentation).
Together with bus-drivers, level converters and
multiplexers it is suitable for connecting electronic
programmable and non-programmable equipment to an
IEC/IEEE interface bus.
All inputs have standard HE4000B family levels.
In the circuit the following standard interface functions are
incorporated:
• Complete source handshake (subset SH1)
• Complete acceptor handshake (subset AH1)
• Basic talker with serial poll and talk-only mode (when It
= LOW, subset T1; It = HIGH, subset T5)
• Basic listener with listen-only mode (when It = LOW,
subset L1; It = HIGH, subset L3)
• Complete service request (subset SR1)
• Complete remote local (subset RL1)
• Remote parallel poll configuration (subset PP1)
• Complete device clear (subset DC1)
• Complete device trigger (subset DT1)
• Some controller facilities
Fig.1 Basic IEC/IEEE bus interface using the HEF4738V.
SUPPLY VOLTAGE
RATING
−0,5 to 18
RECOMMENDED OPERATING
4,5 to 12,5 V
FAMILY DATA, IDD LIMITS category LSI
See Family Specifications
January 1995
2