Rainbow Electronics MG260 - Manual (Page 62)

MG260 Product Specification
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2.9.2.3 Serial links
Signal Pin I/O I/O type Level Comment
GPS Serial Link
GPS_TXD0 3 I CMOS 2.8 V VIL
≤ 0.3 x VCC
VIH
≥ 0.7 x VCC
GPS_RXD0 4 O 100K pull-up VOL
≤ 0.1V
VOH
≥ 1.6V
GSM Serial Link
GSM_TXD1 59 I CMOS 2.8 V VIL
≤ 0.3 x VCC
VIH
≥ 0.7 x VCC
GSM_RXD1 52 O CMOS
2.8 V / 3X VOL
≤ 0.1V
VOH
≥ 2.7 V
GSM_CTS1 57 O CMOS
2.8 V / 3X VOL
≤ 0.1V
VOH
≥ 2.7 V
GSM_RTS1 50 I CMOS 2.8 V VIL
≤ 0.3 x VCC
VIH
≥ 0.7 x VCC
GSM_DSR1 56 O CMOS
2.8 V / 3X VOL
≤ 0.1V
VOH
≥ 2.7 V
GSM_DTR1 54 I CMOS 2.8 V VIL
≤ 0.3 x VCC
VIH
≥ 0.7 x VCC
GSM_DCD1 71 O CMOS
2.8 V / 2X VOL
≤ 0.1V
VOH
≥ 2.7 V
GSM_RI1 74 O CMOS
2.8 V / 2X VOL
≤ 0.1V
VOH
≥ 2.7 V
* with VCC= 1.8 V or 2.8 V according to the type of CMOS voltage
**1.7 V for CMOS 1.8 V; 2.7 V for CMOS 2.8 V.
The rising time and falling time of the reception signals (mainly GSM_RTS1) have to be less than 200 ns.