|Category||Logic => Buffers/Inverters => 3-State|
|Description||Octal D-type Transparent Latches With 3-state Outputs|
|Company||Texas Instruments, Inc.|
|Datasheet||Download SN54ALS563A datasheet
|SN54ALS563A, SN74ALS563B OCTAL D-TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS
3-State Buffer-Type Outputs Drive Bus-Lines Directly Bus Structured Pinout Package Options include Plastic Small Outline Package, Ceramic Chip Carriers and Standard Plastic and Ceramic DIPs Dependable Texas Instruments Quality and Reliabilitydescription
These 8-bit latches feature three-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The eight latches are transparent D-type latches. While the enable (C) is high the Q outputs will follow the complements of data (D) inputs. When the enable is taken low the output will be latched at the inverses of the levels that were set up at the D inputs. A buffered output-control input can be used to place the eight outputs in either a normal logic state (high or low logic levels) or a high-impedance state. In the high-impedance state the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased high-logic level provide the capability to drive the bus lines in a bus-organized system without need for interface or pull-up components. The output control (OC) does not affect the internal operation of the latches. Old data can be retained or new data can be entered while the outputs are in the high-impedance state. The SN54ALS563A is characterized for operation over the full military temperature range to 125°C. The SN74ALS563B is characterized for operation from to 70°C.FUNCTION TABLE (each latch) INPUTS ENABLE D OC OUTPUT Q0 Z
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
4D This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for DW, J, and N packages.absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC. 7 V Input voltage. 7 V Voltage applied to a disabled 3-state output. 5.5 V Operating free-air temperature range: to 70°C Storage temperature range. to 150°C
SN54ALS563A MIN VCC VIH VIL IOH IOL tw tsu th TA Supply Voltage High-level input voltage Low-level input voltage High-level output current Low-level output current Pulse duration, C high Setup time, data before C Hold time, data after C Operating free-air temperature NOM 5 MAX 5.5 SN74ALS563B MIN NOM 5 MAX 5.5 UNIT ns °C
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
Outputs disabled All typical Values are at VCC = 25°C. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
§ For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTE 1: Load circuit and voltage waveforms are shown in Section 1 of the ALS/AS Logic Data Book, 1986.
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