PDF《SN54ABTR2245, SN74ABTR2245》

SN54ABTR2245, SN74ABTR2245 OCTAL TRANSCEIVERS AND LINE/MEMORY DRIVERS WITH 3-STATE OUTPUTS SCBS680A C MARCH

1997 C REVISED MAY

1997 1 POST OFFICE BOX

655303 ? DALLAS, TEXAS

75265 D Outputs Have Equivalent 25-? Series Resistors, So No External Resistors Are Required D State-of-the-Art EPIC-ΙΙB? BiCMOS Design Significantly Reduces Power Dissipation D High-Impedance State During Power Up and Power Down D Latch-Up Performance Exceeds

500 mA Per JEDEC Standard JESD-17 D ESD Protection Exceeds

2000 V Per MIL-STD-833, Method 3015;

Exceeds

200 V Using Machine Model (C =

200 pF, R = 0) D Typical VOLP (Output Ground Bounce) <

1 V at VCC =

5 V, TA = 25°C D Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB), Thin Shrink Small-Outline (PW), and Thin Very Small-Outline (DGV) Packages, Ceramic Chip Carriers (FK), and Plastic (N) and Ceramic (J) DIPs description These octal transceivers and line drivers are designed for asynchronous communication between data buses.

The devices transmit data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated. Both the A-port and B-port outputs, which are designed to sink up to

12 mA, include equivalent 25-? series resistors to reduce overshoot and undershoot. When VCC is between

0 and 2.1 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 2.1 V, 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 SN54ABTR2245 is characterized for operation over the full military temperature range of C55°C to 125°C. The SN74ABTR2245 is characterized for operation from C40°C to 85°C. FUNCTION TABLE INPUTS OPERATION OE DIR OPERATION L L B data to A bus L H A data to B bus H X Isolation SN54ABTR2245 . . . J PACKAGE SN74ABTR2245 . . . DB, DGV, DW, N, OR PW PACKAGE (TOP VIEW)

3 2

1 20

19 9

10 11

12 13

4 5

6 7

8 18

17 16

15 14 B1 B2 B3 B4 B5 A3 A4 A5 A6 A7 A2 A1 DIR B7 B6 OE A8 GND B8 V CC SN54ABTR2245 . . . FK PACKAGE (TOP VIEW)

1 2

3 4

5 6

7 8

9 10

20 19

18 17

16 15

14 13

12 11 DIR A1 A2 A3 A4 A5 A6 A7 A8 GND VCC OE B1 B2 B3 B4 B5 B6 B7 B8 EPIC-ΙΙB is a trademark of Texas Instruments Incorporated. Copyright ? 1997, Texas Instruments Incorporated 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. 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. SN54ABTR2245, SN74ABTR2245 OCTAL TRANSCEIVERS AND LINE/MEMORY DRIVERS WITH 3-STATE OUTPUTS SCBS680A C MARCH

1997 C REVISED MAY

1997 2 POST OFFICE BOX

655303 ? DALLAS, TEXAS

75265 logic symbol? ? This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. B2

17 B3

16 B4

15 A5

6 A6

7 A7

8 A8

9 A2

3 A3

4 A4

5 OE A1

2 G3

19 3 EN2 [AB] B5

14 B6

13 B7

12 B8

11 B1

18 3 EN1 [BA]

1 DIR

1 2 logic diagram (positive logic) DIR OE A1 B1 To Seven Other Channels