SN54BCT573

Pinout




Specifications

Supply voltage range, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
Input voltage range, V_I (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
Voltage range applied to any output in the disabled or power-off state, V_O . . . .  0.5 V to 5.5 V
Voltage range applied to any output in the high state, V_O. . . . . . . . . . . . . . . . . . . . 0.5 V to V_CC
Input clamp current, I_IK (V _I  < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   30 mA
Current into any output in the low state, I_O: SN54BCT573. . . . . . . . . . . . . . . . . . . . . . . . . .  96 mA
                                                                       SN74BCT573. . . . . . . . . . . . . . . . . . . . . . . . .  128 mA
Operating free-air temperature range: SN54BCT573. . . . . . . . . . . . . . . . . . . . . 55°C to 125°C
                                                              SN74BCT573  . . . . . . . . . . . . . . . . . . . . . . . . 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.


Description

These 8-bit latches feature 3-state outputs of SN54BCT573 designed specifically for driving highly capacitive or relatively low-impedance loads. SN54BCT573 is particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.


The eight latches of the SN54BCT573 are transparent D-type latches. While the latch-enable (LE) input is high, the Q outputs will follow the data (D) inputs. When the latch enable is taken low, the Q outputs will be latched at the logic levels that were set up at the D inputs.


A buffered output-enable (OE) input of SN54BCT573 can be used 8D LE 8Q 7Q to place the eight outputs in either a normal logic GND state (high or low logic levels) or a high-impedance state. In the high-impedance state, the outputs of SN54BCT573 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 components.


The output of SN54BCT573 enable (OE) does not affect the internal operations of the latches. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.


The SN54BCT573 is characterized for operation over the full military temperature range of 55°C to 125°C. The SN74BCT573 is characterized for operation from  0°C to 70°C.