SRT512_12 datasheet(39/46 Pages) STMICROELECTRONICS

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SRT512

DC and AC parameters

Doc ID 13277 Rev 6

39/46

DC and AC parameters

Table 6.

Operating conditions

Symbol

Parameter

Min.

Max.

Unit

Ambient operating temperature

–20

°C

Table 7.

DC characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Unit

VCC

Regulated voltage

2.5

3.5

ICC

Supply current (active in read)

VCC = 3.0 V

100

µA

ICC

Supply current (active in write)

VCC = 3.0 V

250

µA

VRET

Backscattering-induced voltage

ISO10373-6

CTUN

Internal tuning capacitor

(1)

Based on automated production test equipment for which the typical value is 66.2 pF.

−3%

64.0

+3%

Table 8.

AC characteristics(1)

Symbol

Parameter

Condition

Min

Max

Unit

fCC

External RF signal frequency

13.553

13.567

MHz

MICARRIER Carrier modulation index

MI=(A-B)/(A+B)

tRFR,tRFF 10% rise and fall times

0.8

2.5

µs

tRFSBL

Minimum pulse width for start bit

ETU = 128/fCC

9.44

µs

tJIT

ASK modulation data jitter

Coupler to SRT512

–2

µs

tMIN CD

Minimum time from carrier

generation to first data

Subcarrier frequency

fCC/16

847.5

kHz

Antenna reversal delay

128/fS

151

µs

Synchronization delay

128/fS

151

µs

Answer to new request delay

14 ETU

132

µs

tDR

Time between request characters

Coupler to SRT512

µs

tDA

Time between answer characters

SRT512 to coupler

µs

Programming time for write

With no auto-erase cycle

(OTP)

-3

With auto-erase cycle

(EEPROM)

-5

Binary counter decrement

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