Texas Instruments JM38510-37203BRA, JM38510-37203B2A, SN54ALS373J, SN54AS373J, SN74AS373DW Datasheet

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)
									VCC
OE					1	20
1Q					2	19			8Q
1D					3	18			8D
2D					4	17			7D
2Q					5	16			7Q
3Q					6	15			6Q
3D		7				14			6D
4D					8	13			5D
4Q		9				12			5Q

GND 10 11 LE

SN54ALS373, SN54AS373 . . . FK PACKAGE

(TOP VIEW)

	1D	1Q	OE	CC	8Q
				V
2D	3	2	1	20 19		8D
	4				18
2Q	5				17	7D
3Q	6				16	7Q
3D	7				15	6Q
4D	8				14	6D
	9	10 11 12 13
	4Q	GND	LE	5Q	5D

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		OUTPUT
		LE	D	Q
	OE
	L	H	H	H
	L	H	L	L
	L	L	X	Q0
	H	X	X	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

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SN54ALS373, SN54AS373, SN74ALS373A, SN74AS373

OCTAL TRANSPARENT D-TYPE LATCHES

WITH 3-STATE OUTPUTS

SDAS083B ± APRIL 1982 ± REVISED DECEMBER 1994

logic symbol²									logic diagram (positive logic)
		1										1
				EN
OE										OE
11
	LE			C1						LE		11
3							2
	1D			1D				1Q
4							5											C1
	2D						6	2Q																	2			1Q
7								3Q		1D		3						1D
	3D
8							9
	4D							4Q
13							12
	5D							5Q
14							15
	6D							6Q
17							16							To Seven Other Channels
	7D							7Q
18							19
	8D							8Q

²This 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)³

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

³Stresses beyond those listed under ªabsolute maximum ratingsº 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 ªrecommended operating conditionsº is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

recommended operating conditions

		SN54ALS373			SN74ALS373A			UNIT
		MIN	NOM	MAX	MIN	NOM	MAX
VCC	Supply voltage	4.5	5	5.5	4.5	5	5.5	V
VIH	High-level input voltage	2			2			V
VIL	Low-level input voltage			0.7			0.8	V
IOH	High-level output current			± 1			± 2.6	mA
IOL	Low-level output current			12			24	mA
tw	Pulse duration, LE high	12			10			ns
tsu	Setup time, data before LE↓	10			10			ns
th	Hold time, data after LE↓	7			7			ns
TA	Operating free-air temperature	± 55		125	0		70	°C

2	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	TEST CONDITIONS		SN54ALS373			SN74ALS373A			UNIT
				MIN	TYP²	MAX	MIN	TYP²	MAX
	VIK	VCC = 4.5 V,	II = ± 18 mA			± 1.5			± 1.5	V
		VCC = 4.5 V to 5.5 V,	IOH = ± 0.4 mA	VCC ± 2			VCC ± 2
	VOH	VCC = 4.5 V	IOH = ± 1 mA	2.4	3.3					V
			IOH = ± 2.6 mA				2.4	3.2
	VOL	VCC = 4.5 V	IOL = 12 mA		0.25	0.4		0.25	0.4	V
			IOL = 24 mA					0.35	0.5
	IOZH	VCC = 5.5 V,	VO = 2.7 V			20			20	μA
	IOZL	VCC = 5.5 V,	VO = 0.4 V			± 20			± 20	μA
	II	VCC = 5.5 V,	VI = 7 V			0.1			0.1	mA
	IIH	VCC = 5.5 V,	VI = 2.7 V			20			20	μA
	IIL	VCC = 5.5 V,	VI = 0.4 V			± 0.1			± 0.1	mA
	I ³	V = 5.5 V,	V = 2.25 V	± 20		± 112	± 30		± 112	mA
	O	CC	O
			Outputs high		9	16		9	16
	ICC	VCC = 5.5 V								mA
			Outputs low		16	25		16	25
			Outputs disabled		17	27		17	27

²All typical values are at VCC = 5 V, TA = 25°C.

³The 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,
	FROM			TO	R1 = 500 Ω,
					R2 = 500		Ω
PARAMETER							,			UNIT
	(INPUT)			(OUTPUT)	T	= MIN to MAX§
					A
					SN54ALS373			SN74ALS373A
					MIN	MAX		MIN	MAX
tPLH		D		Q	2	17		2	12	ns
tPHL					1	19		4	16
tPLH		LE		Any Q	6	29		6	22	ns
tPHL					1	27		7	23
tPZH					6	22		1	18	ns
	OE			Any Q
tPZL					5	24		5	20
tPHZ					2	16		1	10	ns
	OE			Any Q
tPLZ					2	24		2	12

§ 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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