SN54ABT823
SN54ABT823 is 9-BIT BUS-INTERFACE FLIP-FLOPS manufactured by Texas Instruments.
description
These 9-bit flip-flops feature
3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing wider buffer registers, I/O ports, bidirectional bus drivers with parity, and working registers.
4 3 2 1 28 27 26
3D 5
25 3Q
4D 6
24 4Q
5D 7
23 5Q
NC 8
22 NC
6D 9
21 6Q
7D 10
20 7Q
8D 11
19 8Q
12 13 14 15 16 17 18
9Q
CLKEN
With the clock-enable (CLKEN) input low, the nine D-type edge-triggered flip-flops enter data on the low-to-high transitions of the clock. Taking CLKEN high disables the clock buffer, thus latching the outputs. Taking the clear (CLR) input low causes the nine Q outputs to go low, independently of the clock.
9D
- No internal connection
A buffered output-enable (OE) input can be used to place the nine outputs in either a normal logic state (high or low logic level) 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 increased drive provide the capability to drive bus lines without need for interface or pullup ponents.
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 SN54ABT823 is characterized for operation over the full military temperature range of
- 55°C to 125°C. The SN74ABT823 is characterized for operation from
- 40°C to 85°C.
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-ΙΙB...
