• Device Type: LED / Fluorescent Display Driver

General Features

• 34 high-current output drivers
• Serial data input interface
• Built-in shift register and latch
• Direct LED drive capability
• Suitable for multiplexed display systems

Electrical Characteristics

• Supply Voltage (VDD):
  • 4.5 V to 5.5 V
  • Typical: 5 V
• Output Current:
  • Up to 15–20 mA per output (typical application)
  • Current set by external resistor
• Input Logic:
  • TTL / CMOS compatible
• Power Dissipation:
  • Depends on package and output loading

Internal Functions

• 35-bit serial shift register
• Data latch
• Output buffer drivers
• Brightness control through external resistor

Outputs

• Number of Outputs: 34
• Open-collector/high-current output structure
• Direct connection to:
  • LED arrays
  • 7-segment displays
  • Dot-matrix displays
  • Fluorescent display modules (VFDs)

Serial Interface

• Serial Data Input (DATA)
• Clock Input (CLK)
• Strobe/Latch Input (STB)

Package

• Package Type: DIP
• Pin Count: 40 Pins
• Suffix B7: 40-pin plastic DIP package

Operating Temperature

• 0°C to +70°C (commercial grade)