DIO74557

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© 2024 Dioo Microcircuits Co.,Ltd. Jiangsu

DIO74557• Rev. 1.5

- 3 -

Functional Description

Supply Voltage

Input

Input/Output

Operational

Mode

VCCA

VCCB

EN [1] [2]

Host

SIM Card

1.08 V to 1.95 V

1.65 V to 3.6 V

H

HOST = SIM Card

SIM Card = HOST

Active

1.08 V to 1.95 V

1.65 V to 3.6 V

L

See the below table, Condition B

Shutdown

GND

1.65 V to 3.6 V

X

See the below table, Condition B

Shutdown

1.08 V to 1.95 V

GND

X

See the below table, Condition A

Shutdown

GND

GND

X

See the below table, Condition A

Shutdown

Note:

[1] H = HIGH voltage level; L = LOW voltage level; X = inconsequential.

[2] VIL and VIH are referenced to VCCA. The EN can be controlled by an external device limit of VCCA + 0.3 V.

Pin Condition

Condition A

Condition B

RST_HOST

100 kΩ pull low

100 kΩ pull low

CLK_HOST

100 kΩ pull low

100 kΩ pull low

IO_HOST

5 kΩ pull to VCCA

5 kΩ pull to VCCA

RST_SIM

100 kΩ pull low

400 Ω pull low

CLK_SIM

100 kΩ pull low

400 Ω pull low

IO_SIM

High Z

400 Ω pull low