5

7743A–AERO–07/07

Notes:

1. Groups of pins represent busses where the highest number is the MSB.

2. O = Output; I = Input; Z = High Impedance

3. (*) = active low signal

4. O/Z = if using a configuration with two AT7912Es these signals can directly be con-

nected together (WIROR)

TMS

I

Test Mode Select.

Used to control the test state machine. This input should be

left unconnected or tied to ground during normal operation

TDI

I

Test Data Input.

Provides serial data for the boundary scan logic

TDO

O/Z

Test Data Output.

Serial scan output of the boundary scan path

3

1.5

50

RESET*

I

AT7912E Reset.

Sets the AT7912E to a known state. This input must be

asserted (low) at power-up. The minimum width of RESET

low is 2 cycles when CLK is running

CLK

I

External clock input to AT7912E (max. 5 MHz)

PLLOUT

O

Output of internal PLL.

Used to connect a network of external RC filter devices.

VCC_3VOLT

I

PLL Control signal

Configure PLL for 3.3V or 5V operation

VCC = 5 Volt: connect this signal with GND

VCC = 3.3 Volt: connect this signal with VCC

VCC

Power Supply

GND

Ground

Function

5V

max. output

current [mA]

3.3V

max. output

current [mA]

load [pF]