© 2006 Microchip Technology Inc.

DS21456C-page 5

TC7109/A

Scale Factor Temperature Coefficient

—

1

5

μV/°C

Reading, Ext Ref = 0ppm/°C

Supply Current (V+ to GND)

—

700

1500

3.58MHz Test Circuit

Supply Current (V+ to V-)

—

700

1500

μA

Pins 2-21, 25, 26, 27, 29 Open

Reference Out Voltage

-2.4

-2.8

-3.2

V

Referenced to V+, 25k

Ω

Between V+ and Ref Out

Ref Out Temperature Coefficient

—

80

—

ppm/°C

25k

Ω Between V+ and Ref Out

0°C

Digital

Output High Voltage

3.5

4.3

—

V

Pins 3 -16, 18, 19, 20

Output Low Voltage

—

0.2

0.4

Output Leakage Current

—

±0.01

±1

μA

Pins 3 -16 High-Impedance

Control I/O Pull-up Current

—

5

—

μF

Mode Input at GND

Control I/O Loading

—

—

50

pF

HBEN, Pin 19; LBEN, Pin 18

Input High Voltage

2.5

—

—

V

Pins 18 -21, 26, 27

Referenced to GND

Input Low Voltage

—

—

1

V

Pins 18-21, 26, 27

Referenced to GND

Input Pull-up Current

—

—

5

25

—

—

μA

μA

Input Pull-down Current

—

1

—

μA

Oscillator Output Current, High

—

1

—

mA

Oscillator Output Current, Low

—

1.5

—

mA

Buffered Oscillator Output Current High

—

2

—

mA

Buffered Oscillator Output Current Low

—

5

—

mA

Mode Input Pulse Width

60

—

—

nsec

HANDLING PRECAUTIONS: These devices are CMOS and must be handled correctly to prevent damage. Package

and store only in conductive foam, antistatic tubes, or other conducting material. Use proper antistatic handling pro-

cedures. Do not connect in circuits under “power-on” conditions, as high transients may cause permanent damage.

TC7109/TC7109A ELECTRICAL SPECIFICATIONS (Continued)

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Note

1:

Input voltages may exceed supply voltages if input current is limited to ±100

μA.

2: Connecting any digital inputs or outputs to voltages greater than V+ or less than GND may cause destructive device

latch-up. Therefore, it is recommended that inputs from sources other than the same power supply should not be applied

to the TC7109A before its power supply is established. In multiple supply systems, the supply to the device should be

activated first.

3: This limit refers to that of the package and will not occur during normal operation.