The SP721 is an array of SCR/Diode bipolar structures for ESD and over-voltage protection to sensitive input circuits. The SP721 has 2 protection SCR/Diode device structures per input. There are a total of 6 available inputs that can be used to protect up to 6 external signal or bus lines. Over-voltage protection is from the IN (Pins 1 - 3 and Pins 5 - 7) to V+ or V-.

The SCR structures are designed for fast triggering at a threshold of one +VBE diode threshold above V+ (Pin 8) or a -VBE diode threshold below V- (Pin 4). From an IN input, a clamp to V+ is activated if a transient pulse causes the input to be increased to a voltage level greater than one VBE above V+. A similar clamp to V- is activated if a negative pulse, one VBE less than V-, is applied to an IN input.

Features

• ESD Interface Capability for HBM Standards

- MIL STD 3015.7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15kV

- IEC 61000-4-2, Direct Discharge,

- Single Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4kV (Level 2)

- Two Inputs in Parallel . . . . . . . . . . . . . . . . . . . . . . . . . . 8kV (Level 4)

- IEC 61000-4-2, Air Discharge . . . . . . . . . . . . . . . . . . 15kV (Level 4)

• High Peak Current Capability

- IEC 61000-4-5 (8/20µs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3A

- Single Pulse, 100µs Pulse Width . . . . . . . . . . . . . . . . . . . . . . . . ±2A

- Single Pulse, 4µs Pulse Width . . . . . . . . . . . . . . . . . . . . . . . . . . ±5A

• Designed to Provide Over-Voltage Protection

- Single-Ended Voltage Range to . . . . . . . . . . . . . . . . . . . . . . . . +30V

- Differential Voltage Range to. . . . . . . . . . . . . . . . . . . . . . . . . . . ±15V

• Fast Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2ns Rise Time

• Low Input Leakages . . . . . . . . . . . . . . . . . . . . . . . . 1nA at 25°C Typical

• Low Input Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3pF Typical

• An Array of 6 SCR/Diode Pairs

• Operating Temperature Range . . . . . . . . . . . . . . . . . . . . -40°C to 105°C

Applications

• Microprocessor/Logic Input Protection

• Data Bus Protection

• Analog Device Input Protection

• Voltage Clamp