Datasheet

 2011-2013 Microchip Technology Inc. DS70657G-page 417
dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
TABLE 30-24: TIMER2 AND TIMER4 (TYPE B TIMER) EXTERNAL CLOCK TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
-40°C  T
A  +125°C for Extended
Param
No.
Symbol Characteristic
(1)
Min. Typ. Max. Units Conditions
TB10 TtxH TxCK High
Time
Synchronous
mode
Greater of:
20 or
(T
CY + 20)/N
— — ns Must also meet
Parameter TB15,
N = prescale
value
(1, 8, 64, 256)
TB11 TtxL TxCK Low
Time
Synchronous
mode
Greater of:
20 or
(T
CY + 20)/N
— — ns Must also meet
Parameter TB15,
N = prescale
value
(1, 8, 64, 256)
TB15 TtxP TxCK
Input
Period
Synchronous
mode
Greater of:
40 or
(2 T
CY + 40)/N
— — ns N = prescale
value
(1, 8, 64, 256)
TB20 T
CKEXTMRL Delay from External TxCK
Clock Edge to Timer
Increment
0.75 T
CY + 40 — 1.75 TCY + 40 ns
Note 1: These parameters are characterized, but are not tested in manufacturing.
TABLE 30-25: TIMER3 AND TIMER5 (TYPE C TIMER) EXTERNAL CLOCK TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
-40°C  T
A  +125°C for Extended
Param
No.
Symbol Characteristic
(1)
Min. Typ. Max. Units Conditions
TC10 TtxH TxCK High
Time
Synchronous T
CY + 20 — — ns Must also meet
Parameter TC15
TC11 TtxL TxCK Low
Time
Synchronous T
CY + 20 — — ns Must also meet
Parameter TC15
TC15 TtxP TxCK Input
Period
Synchronous,
with prescaler
2 T
CY + 40 — — ns N = prescale
value
(1, 8, 64, 256)
TC20 T
CKEXTMRL Delay from External TxCK
Clock Edge to Timer
Increment
0.75 TCY + 40 — 1.75 TCY + 40 ns
Note 1: These parameters are characterized, but are not tested in manufacturing.