ST7GEME4 datasheet(19/28 Pages) STMICROELECTRONICS

19 / 28 page

ST7GEME4

Electrical characteristics

19/28

Figure 6.

Typical application with a crystal resonator

4.5

Memory characteristics

Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified.

4.6

Smartcard supply supervisor electrical characteristics

Table 18 characteristics are measured at TA = 0 to +70

oC, 4.0 V < V

DD - VSS < 5.5 V unless

otherwise specified.

OSCOUT

OSCIN

fOSC

CL1

CL2

ST7XXX

RESONATOR

WHEN RESONATOR WITH

INTEGRATED CAPACITORS

Table 17.

RAM and hardware registers

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VRM

Data retention mode(1)

Minimum VDD supply voltage without losing data stored in RAM (in Halt mode or under Reset) or in

hardware registers (only in Halt mode). Not tested in production.

Halt mode (or Reset)

Table 18.

Smartcard supply supervisor characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

5 V regulator output (for IEC 7816-3 Class A Cards)

VCRDVCC

SmartCard power supply

voltage

4.6

5.00

5.4

ISC

SmartCard supply current

IOVDET

Current overload detection

120(1)

tIDET

Detection time on current

overload

170(1)

1400(1)

µs

tOFF

VCRDVCC turn-off time

CLOADmax ≤ 4.7µF

750

µs

tON

VCRDVCC turn-on time

CLOADmax ≤ 4.7µF

150

500

µs

VCRDVCC

VCARD above minimum supply

voltage

4.52(1)

4.76(1)

IVDD

VDD supply current

(2)

100

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