8-bit shift register with 250mA/ch

The TPIC6595 is a monolithic,

high-voltage, high-current power 8-bit shift register designed for use in systems

that require relatively high load power. The device contains a built-in voltage

clamp on the outputs for inductive transient protection. Power driver applications

include relays, solenoids, and other medium-current or high-voltage loads.

This device contains an 8-bit

serial-in, parallel-out shift register that feeds an 8-bit D-type storage register.

Data transfers through both the shift and storage registers on the rising edge of

the shift-register clock (SRCK) and the register clock (RCK) respectively. The

storage register transfers data to the output buffer when shift register clear

(SRCLR) is high. Write data and read data are valid only

when RCK is low. When SRCLR is low, the input shift register is

cleared. When output enable (G) is held high, all data in the

output buffers is held low and all drain outputs are off. When

G is held low, data from the storage register is

transparent to the output buffers. The serial output (SER OUT) allows for cascading

of the data from the shift register to additional devices.

Outputs are low-side, open-drain DMOS transistors with output ratings of 45V and

250mA continuous sink current capability. When data in the output buffers is low,

the DMOS-transistor outputs are off. When data is high, the DMOS-transistor outputs

have sink current capability.

Separate

power and logic level ground pins are provided to facilitate maximum system

flexibility. Pins 1, 10, 11, and 20 are internally connected, and each pin must be

externally connected to the power system ground in order to minimize parasitic

inductance. A single-point connection between pin 19, logic ground (LGND), and pins

1, 10, 11, and 20, power grounds (PGND), must be externally made in a manner that

reduces crosstalk between the logic and load circuits. The TPIC6595 is characterized

for operation over the operating case temperature range of −40°C to 125°C.