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M41T11 Datasheet(PDF) 20 Page - STMicroelectronics |
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M41T11 Datasheet(HTML) 20 Page - STMicroelectronics |
20 / 29 page DC and AC parameters M41T11 20/29 Table 6. Capacitance Symbol Parameter(1)(2) 1. Effective capacitance measured with power supply at 5V; sampled only, not 100% tested. 2. At 25°C, f = 1MHz. Min Max Unit CIN Input capacitance (SCL) 7 pF COUT (3) 3. Outputs deselected. Output capacitance (SDA, FT/OUT) 10 pF tLP Low-pass filter input time constant (SDA and SCL) 250 1000 ns Table 7. DC characteristics Symbol Parameter Test Condition(1) 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 2.0 to 5.5V (except where noted). Min Typ Max Unit ILI Input leakage current 0V ≤V IN ≤VCC ±1 µA ILO Output leakage current 0V ≤V OUT ≤VCC ±1 µA ICC1 Supply current Switch frequency = 100kHz 300 µA ICC2 Supply current (standby) SCL, SDA = VCC – 0.3V 70 µA VIL Input low voltage –0.3 0.3VCC V VIH Input high voltage 0.7VCC VCC + 0.5 V VOL Output low voltage IOL = 3mA 0.4 V Pull-up supply voltage (open drain) FT/OUT 5.5 V VBAT (2) 2. STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply. Battery supply voltage 2.5(3) 3. After switchover (VSO), VBAT(min) can be 2.0V for crystal with RS = 40KΩ. 33.5(4) 4. For rechargeable back-up, VBAT(max) may be considered VCC. V IBAT Battery supply current TA = 25°C, VCC = 0V, oscillator ON, VBAT = 3V 0.8 1 µA Table 8. Crystal electrical characteristics Symbol Parameter(1)(2)(3) 1. These values are externally supplied if using the SO8 package. STMicroelectronics recommends the KDS DT-38: 1TA/1TC252E127, Tuning Fork Type (thru-hole) or the DMX-26S: 1TJS125FH2A212, (SMD) quartz crystal for industrial temperature operations. KDS can be contacted at kouhou@kdsj.co.jp or http://www.kdsj.co.jp for further information on this crystal type. 2. Load capacitors are integrated within the M41T11. Circuit board layout considerations for the 32.768kHz crystal of minimum trace lengths and isolation from RF generating signals should be taken into account. 3. All SNAPHAT ® battery:crystal tops meet these specifications. Min Typ Max Unit fO Resonant frequency 32.768 kHz RS Series resistance 60 k Ω CL Load capacitance 12.5 pF |
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