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DS75325 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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DS75325 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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TLF9755 June 1992 DS75325 Memory Drivers General Description The DS75325 is a monolithic memory driver which features high current outputs as well as internal decoding of logic inputs This circuit is designed for use with magnetic memo- ries The circuit contains two 600 mA sink-switch pairs and two 600 mA source-switch pairs Inputs A and B determine source selection while the source strobe (S1) allows the selected source turn on In the same manner inputs C and D determine sink selection while the sink strobe (S2) allows the selected sink turn on Sink-output collectors feature an internal pull-up resistor in parallel with a clamping diode connected to VCC2 This pro- tects the outputs from voltage surges associated with switching inductive loads The source stage features Node R which allows extreme flexibility in source current selection by controlling the amount of base drive to each source transistor This method of setting the base drive brings the power associated with the resistor outside the package thereby allowing the circuit to operate at higher source currents for a given junction temperature If this method of source current setting is not desired then Nodes R and RINT can be shorted externally activating an internal resistor connected from VCC2 to Node R This provides adequate base drive for source currents up to 375 mA with VCC2 e 15V or 600 mA with VCC2 e 24V Features Y 600 mA output capability Y 24V output capability Y Dual sink and dual source outputs Y Fast switching times Y Source base drive externally adjustable Y Input clamping diodes Y TTL compatible Connection Diagram Dual-In-Line Package TLF9755 – 2 Top View Order Number DS75325N See NS Package Number N14A Truth Table Address Inputs Strobe Inputs Outputs Source Sink Source Sink Source Sink A B C D S1 S2 W X Y Z L H X X L H ON OFF OFF OFF H L X X L H OFF ON OFF OFF X X L H H L OFF OFF ON OFF X X H L H L OFF OFF OFF ON X X X X H H OFF OFF OFF OFF H H H H X X OFF OFF OFF OFF H e High Level L e Low Level X e Irrelevant Note Not more than one output is to be on at any one time C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
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