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| 型号： | 933567190652 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 总线收发器 |
| 英文描述： | 4000/14000/40000 SERIES, OCTAL 1-BIT TRANSCEIVER, TRUE OUTPUT, PDIP20 |
| 封装： | PLASTIC, SOT-146-1, DIP-20 |
| 文件页数： | 2/6页 |
| 文件大小： | 80K |
| 代理商： | 933567190652 |
January 1995
2
Philips Semiconductors
Product specication
Octal bus transceiver with 3-state outputs
HEF40245B
buffers
DESCRIPTION
The HEF40245B is an octal bus transmitter/receiver
designed for 8-line asynchronous, 2-way data
communication between data buses. It features output
stages with high current output capability suitable for
driving highly capacitive loads.
The direction input (DR) controls transmission of data from
bus A to bus B, or bus B to bus A, depending on its logic
level. The 3-state outputs are controlled by the enable
input EO. A HIGH on EO causes the outputs to assume a
high impedance OFF-state. The device also features
hysteresis on all inputs to improve noise immunity.
Schmitt-trigger action in the inputs makes the circuit highly
tolerant to slower input rise and fall times.
The HEF40245B is pin and functionally compatible with
the TTL ‘245’ device.
Fig.1 Pinning diagram.
PINNING
FAMILY DATA, IDD LIMITS category buffers
See Family Specifications.
A0 to A7
data input/output
B0 to B7
data input/output
DR
direction input
EO
output enable input (active LOW)
HEF40245BP(N): 20-lead DIL; plastic (SOT146-1)
HEF40245BD(F):
20-lead DIL; ceramic (cerdip) (SOT152)
HEF40245BT(D):
20-lead SO; plastic (SOT163-1)
( ): Package Designator North America
Fig.2
Logic diagram; for functional diagram see
Fig.3.
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