1 Features

• Low rDS(on): 1Ω (Typical)

• Output short-circuit protection

• Avalanche energy: 75mJ

• Eight 350mA DMOS outputs

• 50V Switching capability

• Enhanced cascading for multiple stages

• All registers cleared with single input

• Low power consumption

2 Application

• Instrumentation Clusters

• Tell-Tale Lamps

• LED Illumination and Controls

• Automotive Relay or Solenoids Drivers

3 Description

The TPIC6A596 is a monolithic, high-voltage, highcurrent

power logic 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. Each

open-drain DMOS transistor features an independent

chopping current-limiting circuit to prevent damage in

the case of a short circuit.

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 shiftregister

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, all registers in the

device are 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) is clocked out

of the device on the falling edge of SRCK to provide

additional hold time for cascaded applications. This

will provide improved performance for applications

where clock signals may be skewed, devices are not

located near one another, or the system must tolerate

electromagnetic interference.

Outputs are low-side, open-drain DMOS transistors

with output ratings of 50V and a 350mA 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 ground (PGND) and logic ground

(LGND) terminals are provided to facilitate maximum

system flexibility. All PGND terminals are internally

connected, and each PGND terminal must be

externally connected to the power system ground

to minimize parasitic impedance. A single-point

connection between LGND and PGND must be made

externally in a manner that reduces crosstalk between

the logic and load circuits.

The TPIC6A596 is offered in a thermally-enhanced

dual-in-line (NE) package and a wide-body

surface-mount (DW) package. The TPIC6A596 is

characterized for operation over the operating case

temperature range of −40°C to 125°C.