HEF40240B 查看數據表（PDF） - Philips Electronics
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HEF40240B Datasheet PDF : 6 Pages
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Philips Semiconductors
Octal inverting buffers with 3-state outputs
DESCRIPTION
The HEF40240B is an octal inverting buffer with 3-state
outputs. It features output stages with high current output
capability suitable for driving highly capacitive loads.
The 3-state outputs are controlled by the output enable
inputs EOA and EOB. 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 HEF40240B is pin and functionally compatible with
the TTL ‘240’ device.
Product specification
HEF40240B
buffers
Fig.1 Functional diagram.
Fig.2 Pinning diagram.
HEF40240BP(N): 20-lead DIL; plastic (SOT146-1)
HEF40240BD(F): 20-lead DIL; ceramic (cerdip) (SOT152)
HEF40240BT(D): 20-lead SO; plastic (SOT163-1)
( ): Package Designator North America
PINNING
IA1 to IA4
IB1 to IB4
OA1 to OA4
OB1 to OB4
EOA, EOB
inputs
inputs
bus outputs
bus outputs
output enable inputs (active LOW)
FAMILY DATA, IDD LIMITS category buffers
See Family Specifications
January 1995
2
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