5 Electrical specifications of the SIM – ME interface

11.123GPPSpecification on the 3 volt subscriber identity module Equipment (SIM-ME) InterfaceTS

The electrical specification given in this ETS covers the supply voltage range from 2,7V to 3,3V. The supply voltage range from 4,5V to 5,5V is specified in GSM 11.11 (ETS 300 608) [1]. For each state (VOH, VIH, VIL and VOL) a positive current is defined as flowing out of the entity (ME or SIM) in that state. Vpp is not supported by the 3V technology ME or the 3V technology SIM.

When the SIM is in idle state the current consumption of the card shall not exceed 200 µA at 1 MHz at +25°C. When the SIM is in clock stop mode the current consumption shall not exceed 100 µA at +25 °C.

The ME shall source the maximum current as defined in table 4. It shall also be able to counteract spikes in the current consumption of the card up to a maximum charge of 12 nAs with no more than 400 ns duration and an amplitude of at most 60 mA, ensuring that the supply voltage stays in the specified range.

The clock duty cycle shall be between 40 % and 60 % of the period during stable operation. A clock cycle is defined at 50% of Vcc from rising to rising edge or falling to falling edge. When switching clock frequencies MEs shall ensure that no pulse is shorter than 100 ns which is 40 % of the shortest allowed period.

The ME need not provide contact C6 (Vpp). Contact C6 shall not be connected in the ME if provided.

Table 1. Electrical characteristics of I/O under normal operating conditions

Symbol

Conditions

Minimum

Maximum

Unit

VIH

IIHmax = ± 20 µA (Note 2)

0,7 x Vcc

Vcc+0,3

V

VIL

IILmax = + 1 mA

– 0,3

0,2 x Vcc

V

VOH (Note 1)

IOHmax = + 20 µA

0,7 x Vcc

Vcc (Note 3)

V

VOL

IOLmax = – 1mA

0 (Note 3)

0,4

V

tR tF

Cin = Cout = 30 pF

1

µs

NOTE 1: It is assumed that a pull-up resistor is used on the interface device (recommended value: 20 k ).

NOTE 2: During static conditions (idle state) only the positive value can apply. Under dynamic operating conditions (transmissions) short term voltage spikes on the I/O line may cause a current reversal.

NOTE 3: To allow for overshoot the voltage on I/O shall remain between -0,3V and Vcc+0,3V during dynamic operation.

Table 2. Electrical characteristics of Clock (CLK) under normal operating conditions

Symbol

Conditions

Minimum

Maximum

Unit

VOH

IOHmax = + 20 µA

0,7 x Vcc

Vcc (Note )

V

VOL

IOLmax = – 20 µA

0 (Note )

0,2 x Vcc

V

tR tF

Cin = Cout = 30 pF

50

ns

NOTE: To allow for overshoot the voltage on CLK should remain between -0,3V and Vcc+0,3V during dynamic operations.

Table 3. Electrical characteristics of RESET (RST) under normal operating conditions in idle state

Symbol

Conditions

Minimum

Maximum

Unit

VOH

IOHmax = + 20 µA

0,8 x Vcc

Vcc (Note)

V

VOL

IOLmax = -200 µA

0 (Note)

0,2 x Vcc

V

tR tF

Cin = Cout = 30 pF

400

µs

NOTE: To allow for overshoot the voltage on RST should remain between -0,3V and Vcc +0,3V during dynamic operations.

Table 4. Electrical characteristics of RESET (RST) under normal operating conditions in operating state

Symbol

Conditions

Minimum

Maximum

Unit

VOH

IOHmax = + 200 µA

0,8 x Vcc

Vcc (Note)

V

VOL

IOLmax = -200 µA

0 (Note)

0,2 x Vcc

V

tR tF

Cin = Cout = 30 pF

400

µs

NOTE : To allow for overshoot the voltage on RST should remain between -0,3V and

Vcc +0,3V during dynamic operations.

The value for IOHmax will be reconsidered in 1997 to reduce the power consumption of the ME. The value aimed at is +20 µA

Table 5. Electrical characteristics of Vcc under normal operating conditions

Symbol

Minimum

Maximum

Unit

Vcc

2,7

3,3

V

Icc

6 (Note)

mA

NOTE: The supply current at 3,3V refers to a clock frequency of 4 MHz.

Annex A (informative): Cross compatibility aspects

Table A.1 shows the impacts of selecting different start-up scenarios between different technology SIMs and MEs. The table also takes into account possible future migration to new technology.

Table A.1

ME

SIM

5V

3V –> 5V Note 1

5V –> 3V Note 2

3V

3V –> Future

Future Note 3

5V Only

OK

Working at 5V

OK

Not Working

Not Working

Not Working

3V&5V

OK

OK

OK

OK

OK

Not Working

3V Only

Note 4

Not Working (Damage?)

OK

OK

(Damage?)

OK

OK

Not Working

3V&Future

Damaged?

OK

Damaged?

OK

OK

OK

Future

Note 3

Destroyed?

Unknown

Destroyed?

Unknown

OK ?

OK

NOTE 1: An ME supporting both 3V and 5V is not allowed to power up the SIM initially at 3V. The column is only for information what effects starting up initially at 3V would have.

NOTE 2: The ME starts up the SIM by first applying 5V to the SIM and if a 3V technology SIM is identified the ME may restart the SIM at 3V.

NOTE 3: The Future technology might be 1-2V.

NOTE 4: 3V only SIMs will not be used for the time being.