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HEF40245B Datasheet(PDF) 2 Page - NXP Semiconductors |
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HEF40245B Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 6 page January 1995 2 Philips Semiconductors Product specification 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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