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Part: SN54LVTT244
Category:
Logic
-> Buffers/Inverters
-> 3-State
-> CMOS/BiCMOS->AC/ACT Family
Description: 3.3-v Abt Octal Buffers/drivers With 3-state Outputs
Company: Texas Instruments, Inc.
Datasheet: Download SN54LVTT244 datasheet File size : 214 kB
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Datasheet text preview:
SN54LVTT244, SN74LVTT244 3.3-V ABT OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS
SCES006 FEBRUARY 1995
· · · · · · ·
State-of-the-Art Advanced BiCMOS Technology (ABT) Design for 3.3-V Operation and Low-Static Power Dissipation Support Mixed-Mode Signal Operation (5-V Input and Output Voltages With 3.3-V VCC) Support Unregulated Battery Operation Down to 2.7 V Typical VOLP (Output Ground Bounce) < 0.8 V at VCC = 3.3 V, TA = 25°C Latch-Up Performance Exceeds 500 mA Per JEDEC Standard JESD-17 Supports Live Insertion Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB), and Thin Shrink Small-Outline (PW) Packages, Ceramic Chip Carriers (FK), Ceramic Flat (W) Packages, and Ceramic (J) DIPs
SN54LVTT244 . . . J OR W PACKAGE SN74LVTT244 . . . DB, DW, OR PW PACKAGE (TOP VIEW)
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
SN54LVTT244 . . . FK PACKAGE (TOP VIEW)
description
These octal buffers and line drivers are designed specifically for low-voltage (3.3-V) VCC operation, but with the capability to provide a TTL interface to a 5-V system environment. The 'LVTT244 are organized as two 4-bit line drivers with separate output-enable (OE) inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state.
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
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. The SN74LVTT244 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 SN54LVTT244 is characterized for operation over the full military temperature range of 55°C to 125°C. The SN74LVTT244 is characterized for operation from 40°C to 85°C.
FUNCTION TABLE (each buffer) INPUTS OE L L H A H L X OUTPUT Y H L Z
UNLESS OTHERWISE NOTED this document contains PRODUCTION DATA information 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. POST OFFICE BOX 655303
Copyright © 1995, Texas Instruments Incorporated
· DALLAS, TEXAS 75265
2Y1 GND 2A1 1Y4 2A2
1
SN54LVTT244, SN74LVTT244 3.3-V ABT OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS
SCES006 FEBRUARY 1995
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
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54LVTT244, SN74LVTT244 3.3-V ABT OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS
SCES006 FEBRUARY 1995
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 4.6 V Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V Voltage range applied to any output in the high state or power-off state, VO (see Note 1) . . . . 0.5 V to 7 V Current into any output in the low state, IO: SN54LVTT244 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA SN74LVTT244 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA Current into any output in the high state, IO (see Note 2): SN54LVTT244 . . . . . . . . . . . . . . . . . . . . . . . . 48 mA SN74LVTT244 . . . . . . . . . . . . . . . . . . . . . . . . 64 mA Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Output clamp current, IOK (VO < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Maximum power dissipation at TA = 55°C (in still air) (see Note 3): DB package . . . . . . . . . . . . . . . . . . . . 0.6 W DW package . . . . . . . . . . . . . . . . . . . 1.6 W PW package . . . . . . . . . . . . . . . . . . . 0.7 W 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. NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed. 2. This current flows only when the output is in the high state and VO > VCC. 3. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils. For more information, refer to the Package Thermal Considerations application note in the 1994 ABT Advanced BiCMOS Technology Data Book, literature number SCBD002B.
recommended operating conditions (see Note 4)
SN54LVTT244 MIN VCC VIH VIL VI IOH IOL t /v Supply voltage High-level input voltage Low-level input voltage Input voltage High-level output current Low-level output current Input transition rise or fall rate Outputs enabled 55 2.7 2 0.8 5.5 24 48 10 125 40 MAX 3.6 SN74LVTT244 MIN 2.7 2 0.8 5.5 32 64 10 85 MAX 3.6 UNIT V V V V mA mA ns / V °C
TA Operating free-air temperature NOTE 4: Unused or floating control inputs must be held high or low.
PRODUCT PREVIEW information concerns products in the formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
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