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Details, datasheet, quote on part number:SN74ALS373N
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Datasheet text preview:
SN54ALS373, SN54AS373, SN74ALS373A, SN74AS373 OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS
SDAS083B APRIL 1982 REVISED DECEMBER 1994
· · · · · ·
Eight Latches in a Single Package 3-State Bus-Driving True Outputs Full Parallel Access for Loading Buffered Control Inputs pnp Inputs Reduce dc Loading on Data Lines Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs These octal transparent D-type latches feature 3-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. While the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. When LE is taken low, the Q outputs are latched at the logic levels set up at the D inputs. A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high or low) 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 the increased drive provide the capability to drive bus lines without interface or pullup components.
SN54ALS373, SN54AS373 . . . J PACKAGE SN74ALS373A, SN74AS373 . . . DW OR N PACKAGE (TOP VIEW)
OE 1Q 1D 2D 2Q 3Q 3D 4D 4Q GND
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VCC 8Q 8D 7D 7Q 6Q 6D 5D 5Q LE
SN54ALS373, SN54AS373 . . . FK PACKAGE (TOP VIEW)
OE VCC
1D 1Q
2D 2Q 3Q 3D 4D
3 4 5 6 7 8
2 1 20 19 18 17 16 15
8Q 8D 7D 7Q 6Q 6D
14 9 10 11 12 13
OE does not affect internal operations of the latches. Old data can be retained or new data can be entered while the outputs are off. The SN54ALS373 and SN54AS373 are characterized for operation over the full military temperature range of 55°C to 125°C. The SN74ALS373A and SN74AS373 are characterized for operation from 0°C to 70°C.
FUNCTION TABLE (each latch) INPUTS OE L L L H LE H H L X D H L X X OUTPUT Q H L 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.
Copyright © 1994, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
4Q GND LE 5Q 5D
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SN54ALS373, SN54AS373, SN74ALS373A, SN74AS373 OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS
SDAS083B APRIL 1982 REVISED DECEMBER 1994
logic symbol
OE LE 1D 2D 3D 4D 5D 6D 7D 8D 1 11 3 4 7 8 13 14 17 18 EN C1 1D 2 5 6 9 12 15 16 19
logic diagram (positive logic)
OE LE 1Q 2Q 3Q 4Q 5Q 6Q 7Q 8Q To Seven Other Channels 1D 3 C1 1D 2 1Q 1 11
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Voltage applied to any output in the high state or power-off state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range, TA: SN54ALS373 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 125°C SN74ALS373A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN54ALS373 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, LE high Setup time, data before LE Hold time, data after LE Operating free-air temperature 12 10 7 55 125 4.5 2 0.7 1 12 10 10 7 0 70 NOM 5 MAX 5.5 SN74ALS373A MIN 4.5 2 0.8 2.6 24 NOM 5 MAX 5.5 UNIT V V V mA mA ns ns ns °C
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54ALS373, SN54AS373, SN74ALS373A, SN74AS373 OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS
SDAS083B APRIL 1982 REVISED DECEMBER 1994
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER VIK VOH TEST CONDITIONS CONDITIONS VCC = 4.5 V, VCC = 4.5 V to 5.5 V, VCC = 4 5 V 4.5 VCC = 4 5 V 4.5 VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V II = 18 mA IOH = 0.4 mA IOH = 1 mA IOH = 2.6 mA IOL = 12 mA IOL = 24 mA VO = 2.7 V VO = 0.4 V VI = 7 V VI = 2.7 V VI = 0.4 V VO = 2.25 V Outputs high ICC Outputs low 20 9 16 MIN SN54ALS373 TYP MAX 1.5 VCC 2 2.4 VCC 2 3.3 2.4 0.25 0.4 20 20 0.1 20 0.1 112 16 25 30 9 16 3.2 0.25 0.35 0.4 0.5 20 20 0.1 20 0.1 112 16 25 mA V µA µA mA µA mA mA V MIN SN74ALS373A TYP MAX 1.5 UNIT V
VOL IOZH IOZL II IIH IIL IO
Outputs disabled 17 27 17 27 All typical values are at VCC = 5 V, TA = 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.
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX§ SN54ALS373 MIN tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ D LE 2 Q Any Q Any Q Any Q 1 6 1 6 OE OE 5 2 2 MAX 17 19 29 27 22 24 16 24 SN74ALS373A MIN 2 4 6 7 1 5 1 2 MAX 12 16 22 23 18 20 10 12 ns ns ns ns
PARAMETER
FROM (INPUT)
TO (OUTPUT)
UNIT
§ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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