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Part: SNJ54F373W
Category:
Logic
-> Latches
-> D-Type (3-State) Latches
Description: ti SN54F373, Octal Transparent D-type Latches With 3-State Outputs
Company: Texas Instruments, Inc.
Datasheet: Download SNJ54F373W datasheet File size : 214 kB
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SN54F373, SN74F373 OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS
SDFS076A D2932, MARCH 1987 REVISED OCTOBER 1993
· · · · ·
Eight Latches in a Single Package 3-State Bus-Driving True Outputs Full Parallel Access for Loading Buffered Control Inputs Package Options Include Plastic Small-Outline (SOIC) and Shrink Small-Outline (SSOP) Packages, Ceramic Chip Carriers, and Plastic and Ceramic DIPs
SN54F373 . . . J PACKAGE SN74F373 . . . DB, DW, OR N PACKAGE (TOP VIEW)
description
These 8-bit 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. The eight latches of the F373 are transparent D-type latches. While the latch-enable (LE) input is high, the Q outputs will follow the data (D) inputs. When the latch enable 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 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 drive provide the capability to drive bus lines without need for interface or pullup components.
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
SN54F373 . . . FK PACKAGE (TOP VIEW)
1D 1Q OE VCC 2D 2Q 3Q 3D 4D
4 5 6 7 8
3 2 1 20 19 18 17 16 15 14 9 10 11 12 13
8Q 8D 7D 7Q 6Q 6D
The output-enable (OE) input does not affect the internal operations of the latches. Old data can be retained or new data can be entered while the outputs are in the high-impedance state. The SN74F373 is available in TI's shrink small-outline package (DB), which provides the same I/O pin count and functionality of standard small-outline packages in less than half the printed-circuit-board area. The SN54F373 is characterized for operation over the full military temperature range of 55°C to 125°C. The SN74F373 is 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.
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· DALLAS, TEXAS 75265
4Q GND LE 5Q 5D
Copyright © 1993, Texas Instruments Incorporated
1
SN54F373, SN74F373 OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS
SDFS076A D2932, MARCH 1987 REVISED OCTOBER 1993
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 range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 V to 7 V Input current range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA to 5 mA Voltage range applied to any output in the disabled or power-off state . . . . . . . . . . . . . . . . . . . 0.5 V to 5.5 V Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to VCC Current into any output in the low state: SN54F373 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA SN74F373 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA Operating free-air temperature range: SN54F373 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 125°C SN74F373 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.
recommended operating conditions
SN54F373 MIN VCC VIH VIL IIK IOH IOL TA Supply voltage High-level input voltage Low-level input voltage Input clamp current High-level output current Low-level output current Operating free-air temperature 55 4.5 2 0.8 18 3 20 125 0 NOM 5 MAX 5.5 SN74F373 MIN 4.5 2 0.8 18 3 24 70 NOM 5 MAX 5.5 UNIT V V V mA mA mA °C
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54F373, SN74F373 OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS
SDFS076A D2932, MARCH 1987 REVISED OCTOBER 1993
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER VIK VOH VCC = 4.5 V, VCC = 4 5 V 4.5 VCC = 4.75 V, VOL IOZH IOZL II IIH IIL IOS 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, TEST CONDITIONS CONDITIONS II = 18 mA IOH = 1 mA IOH = 3 mA IOH = 1 mA to 3 mA IOL = 20 mA IOL = 24 mA VO = 2.7 V VO = 0.5 V VI = 7 V VI = 2.7 V VI = 0.5 V VO = 0 60 MIN SN54F373 TYP MAX 1.2 2.5 2.4 3.4 3.3 0.3 0.5 0.35 50 50 0.1 20 0.6 150 60 0.5 50 50 0.1 20 0.6 150 55 2.5 2.4 2.7 V µA µA mA µA mA mA mA 3.4 3.3 V MIN SN74F373 TYP MAX 1.2 UNIT V
ICCZ VCC = 5.5 V, See Note 2 38 55 38 All typical values are at VCC = 5 V, TA = 25°C. Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second. NOTE 2: ICCZ is measured with OE at 4.5 V and all other inputs grounded.
timing requirements over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
VCC = 5 V, TA = 25°C F373 MIN tw tsu th Pulse duration, LE high Setup time, data before LE Hold time, data after LE 6 2 3 MAX MIN 6 2 3 MAX MIN 6 2 3 MAX ns ns ns SN54F373 SN74F373
UNIT
switching characteristics (see Note 3)
VCC = 5 V, CL = 50 pF, RL = 500 , TA = 25°C F373 MIN tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ D LE Q Q Q Q 2.2 1.2 4.2 2.2 1.2 1.2 1.2 1.2 TYP 4.9 3.3 8.6 4.8 4.6 5.2 4.1 3.4 MAX 7 5 11.5 7 11 7.5 6.5 6 VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 , TA = MIN to MAX§ SN54F373 MIN 2.2 1.2 4.2 2.2 1.2 1.2 1.2 1.2 MAX 8.5 7 15 8.5 13.5 10 10 7 SN74F373 MIN 2.2 1.2 4.2 2.2 1.2 1.2 1.2 1.2 MAX 8 6 13 8 12 8.5 7.5 6 ns ns ns ns
PARAMETER
FROM (INPUT)
TO (OUTPUT)
UNIT
OE OE
§ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTE 3: Load circuits and waveforms are shown in Section 1.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
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