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| Philips Semiconductors Product specification HEX inverting buffers DESCRIPTION The HEF4049B provides six inverting buffers with high current output capability suitable for driving TTL or high capacitive loads. Since input voltages in excess of the buffers' supply voltage are permitted, the buffers may also be used to convert logic levels of up to 15 V to standard TTL levels. Their guaranteed fan-out into common bipolar logic elements is shown in the table below. HEF4049B buffers HEF4049BP(N): 16-lead DIL; plastic (SOT38-1) HEF4049BD(F): 16-lead DIL; ceramic (cerdip) (SOT74) HEF4049BT(D): 16-lead SO; plastic (SOT109-1) ( ): Package Designator North America Guaranteed fan-out in common logic families DRIVEN ELEMENT standard TTL 74 LS 74 L GUARANTEED FAN-OUT 2 9 16 Fig.3 Logic diagram (one gate). APPLICATION INFORMATION Some examples of applications for the HEF4049B are: * LOCMOS to DTL/TTL converter * HIGH sink current for driving 2 TTL loads Fig.1 Functional diagram. * HIGH-to-LOW level logic conversion Input protection Fig.4 Input protection circuit that allows input voltages in excess of VDD. Fig.2 Pinning diagram. FAMILY DATA, IDD LIMITS category BUFFERS See Family Specifications January 1995 2 |
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