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Details, datasheet, quote on part number:SN74ALS1240DW
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Datasheet text preview:
SN74ALS1240 OCTAL BUFFER AND LINE DRIVER WITH 3-STATE OUTPUTS
SDAS054B DECEMBER 1982 REVISED JANUARY 1995
· · · ·
Low-Power Version of SN74ALS240A 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers pnp Inputs Reduce dc Loading Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (N) 300-mil DIPs
DW OR N PACKAGE (TOP VIEW)
description
13 This octal buffer and line driver is designed 9 12 specifically to improve both the performance and 10 11 density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. The designer has a choice of selected combinations of inverting and noninverting outputs, symmetrical active-low output-enable (OE) inputs, and complementary OE and OE inputs. This device features high fan-out and improved fan-in.
1OE 1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4 2Y1 GND
1 2 3 4 5 6 7 8
20 19 18 17 16 15 14
VC C 2OE 1Y1 2A4 1Y2 2A3 1Y3 2A2 1Y4 2A1
The SN74ALS1240 is characterized for operation from 0°C to 70°C.
logic symbol
1OE 1 EN 18 16 14 12
logic diagram (positive logic)
1OE 1
1A1 1A2 1A3 1A4
2 4 6 8
1Y1 1Y2 1Y3 1Y4
1A1
2
18
1Y1
1A2
4
16
1Y2
1A3 2OE 19 EN 1A4 2A1 2A2 2A3 2A4 11 13 15 17 9 7 5 3 2Y1 2Y2 2Y3 2Y4 2A1 2OE
6
14
1Y3
8
12
1Y4
19
11
9
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
2Y1
2A2
13
7
2Y2
2A3
15
5
2Y3
2A4
17
3
2Y4
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 © 1995, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
SN74ALS1240 OCTAL BUFFER AND LINE DRIVER WITH 3-STATE OUTPUTS
SDAS054B DECEMBER 1982 REVISED JANUARY 1995
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 a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
MIN VCC VIH VIL IOH IOL TA Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current Operating free-air temperature 0 4.5 2 0.8 15 16 70 NOM 5 MAX 5.5 UNIT V V V mA mA °C
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER VIK VOH TEST 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 = 3 mA IOH = 15 mA IOL = 8 mA IOL = 16 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 Outputs disabled 30 5 8.5 8.1 MIN VCC 2 2.4 2 0.25 0.35 0.4 0.5 20 20 0.1 20 0.1 112 8 14 13 mA V µA µA mA µA mA mA TYP MAX 1.2 3.2 UNIT V V
VOL IOZH IOZL II IIH§ IIL§ IO¶
All typical values are at VCC = 5 V, TA = 25°C. § For I/O ports, the parameters IIH and IIL include the off-state output current. ¶ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN74ALS1240 OCTAL BUFFER AND LINE DRIVER WITH 3-STATE OUTPUTS
SDAS054B DECEMBER 1982 REVISED JANUARY 1995
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX MIN tPLH tPHL tPZH tPZL tPHZ tPLZ A 2 Y Y Y 2 4 OE OE 6 2 3 MAX 13 13 20 22 10 13 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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