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Details, datasheet, quote on part number:SN74ACT244DB
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Datasheet text preview:
SN54ACT244, SN74ACT244 OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS
SCAS517B JUNE 1995 REVISED MAY 1996
D D D
Inputs Are TTL Compatible EPIC TM (Enhanced-Performance Implanted CMOS) 1-µm Process Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB), Thin Shrink Small-Outline (PW), and Flat (W) Packages, Ceramic Chip Carriers (FK), and Plastic (N) and Ceramic (J) DIPs
SN54ACT244 . . . J OR W PACKAGE SN74ACT244 . . . DB, DW, N, OR PW PACKAGE (TOP VIEW)
description
These octal buffers/drivers are designed specifically to improve the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. The 'ACT244 are organized as two 4-bit buffers/drivers with separate output-enable (OE) inputs. When OE is low, the device passes noninverted data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state. The SN54ACT244 is characterized for operation over the full military temperature range of 55°C to 125°C. The SN74ACT244 is characterized for operation from 40°C to 85°C.
1OE 1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4 2Y1 GND
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VCC 2OE 1Y1 2A4 1Y2 2A3 1Y3 2A2 1Y4 2A1
SN54ACT244 . . . FK PACKAGE (TOP VIEW)
1A2 2Y3 1A3 2Y2 1A4
4 5 6 7 8
3 2 1 20 19 18 17 16 15 14 9 10 11 12 13
2Y4 1A1 1OE VCC
2OE 1Y1 2A4 1Y2 2A3 1Y3
FUNCTION TABLE (each buffer) INPUTS OE L L H A H L X OUTPUT Y H L Z
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. EPIC is a trademark of Texas Instruments Incorporated.
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 © 1996, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
2Y1 GND 2A1 1Y4 2A2
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SN54ACT244, SN74ACT244 OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS
SCAS517B JUNE 1995 REVISED MAY 1996
logic symbol
1OE 1 EN 18 16 14 12 2OE 19 EN 9 7 5 3
1A1 1A2 1A3 1A4
2 4 6 8
1Y1 1Y2 1Y3 1Y4
2A1 2A2 2A3 2A4
11 13 15 17
2Y1 2Y2 2Y3 2Y4
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
1OE 1 2OE 19
1A1
2
18
1Y1
2A1
11
9
2Y1
1A2
4
16
1Y2
2A2
13
7
2Y2
1A3
6
14
1Y3
2A3
15
5
2Y3
1A4
8
12
1Y4
2A4
17
3
2Y4
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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to VCC + 0.5 V Output voltage range, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to VCC + 0.5 V Input clamp current, IIK (VI VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA Output clamp current, IOK (VO VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±200 mA Maximum power dissipation at TA = 55°C (in still air) (see Note 2): DB package . . . . . . . . . . . . . . . . . . 0.6 W DW package . . . . . . . . . . . . . . . . . . 1.6 W N package . . . . . . . . . . . . . . . . . . . . 1.3 W PW package . . . . . . . . . . . . . . . . . . 0.7 W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. 2. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils, except for the N package, which has a trace length of zero.
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54ACT244, SN74ACT244 OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS
SCAS517B JUNE 1995 REVISED MAY 1996
recommended operating conditions (see Note 3)
SN54ACT244 MIN VCC VIH VIL VI VO IOH IOL t/v Supply voltage High-level input voltage Low-level input voltage Input voltage Output voltage High-level output current Low-level output current Input transition rise or fall rate 0 55 0 0 4.5 2 0.8 VCC VCC 24 24 8 125 0 40 0 0 MAX 5.5 SN74ACT244 MIN 4.5 2 0.8 VCC VCC 24 24 8 85 MAX 5.5 UNIT V V V V V mA mA ns/V °C
TA Operating free-air temperature NOTE 3: Unused inputs must be held high or low to prevent them from floating.
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS CONDITIONS IOH = 50 µA µA VOH IOL = 24 mA A IOH = 50 mA IOH = 75 mA IOL = 50 µA 50 µA VOL IOL = 24 mA 24 mA IOL = 50 mA IOL = 75 mA IOZ II ICC ICC Ci Co VO = VCC or GND VI = VCC or GND VI = VCC or GND, IO = 0 VCC 4.5 V 5.5 V 4.5 V 5.5 V 5.5 V 5.5 V 4.5 V 5.5 V 4.5 V 5.5 V 5.5 V 5.5 V 5.5 V 5.5 V 5.5 V 5.5 V 5V 5V 0.6 2.5 8 ±0.25 ±0.1 4 ±5 ±1 80 1.6 0.001 0.001 0.1 0.1 0.36 0.36 0.1 0.1 0.5 0.5 1.65 1.65 ± 2.5 ±1 40 1.5 µA µA µA mA pF pF TA = 25°C MIN TYP MAX 4.4 5.4 3.86 4.86 4.49 5.49 SN54ACT244 MIN 4.4 5.4 3.7 4.7 3.85 3.85 0.1 0.1 0.44 0.44 V MAX SN74ACT244 MIN 4.4 5.4 3.76 4.76 V MAX UNIT
One input at 3.4 V, Other inputs at GND or VCC VI = VCC or GND VI = VCC or GND
Not more than one output should be tested at a time, and the duration of the test should not exceed 2 ms. This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or VCC.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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