Texas Instruments TMS3637P, Data Manual

Page: 13 / 53

2–3
2.4 Timing Requirements Over Recommended Ranges of Supply Voltages
and Free-Air Temperature
2.4.1 Abort/Retry
MIN NOM MAX
Time between consecutive codes 46 x tw (transmitter)
Time out for high-level bit to abort the code 3 x tw (receiver)
Time out for low-level bit to abort the code 25 x tw (receiver)
Time between aborted code and reading of new code 3 x tw (receiver)
2.4.2 EEPROM Read Mode (see Figure 3–3)
MIN MAX UNIT
tsu2 Setup time, OSCR high after VCC
↑
50 ms
tw4 Pulse width, OSCR high 10
µ
s
tw5 Pulse width, OSCR low 10
µ
s
2.4.3 EEPROM Write Mode (see Figure 3–3 and Figure 3–4)
MIN MAX UNIT
tsu3 Setup time, OSCR high after VCC high 50 ms
tw6 Pulse duration, OSCR high 5
µ
s
tw7 Pulse duration, OSCR low 5
µ
s
tv Valid time, data IN valid before OSCC
↑
10
µ
s
2.4.4 Data Input Setup and Hold Times (see Figure 3–5)
MIN NOM MAX UNIT
tsu4 Setup time, data in before OSCR
↓
1
µ
s
th1 Hold time, data in after OSCR
↓
1
µ
s
2.5 Switching Characteristics Over Recommended Ranges of Supply
Voltages and Free-Air Temperature (unless otherwise noted)
2.5.1 Normal Transmission – Internal Clock (see Figure 3–6)
PARAMETER MIN TYP MAX UNIT
tw8 Pulse duration, half-oscillating period for OSCC sawtooth
↑↓
5 1/(2 x fosc) 100
µ
s
tw9 Pulse duration, logic bit 1 for IN 5 tw 100
µ
s
tw10 Pulse duration, logic bit 0 for IN 35 7 x tw 700
µ
s
2.5.2 Modulated Transmission – Internal Clock
PARAMETER
TEST
CONDITIOINS
MIN TYP MAX UNIT
fosc(t) Transmitter oscillator frequency 100 110 120 kHz
fosc(r) Receiver oscillator frequency 400 440 480 kHz
tw(H) Pulse duration, high-level modulation at IN See Figure 3-7 9 1/fosc(t) 10
µ
s
tc Cycle time, IN See Figure 3-7 27 3 x tw(H) 30
µ
s
tc(total) Total cycle time, IN See Figure 3-7 135 5 x tc 150
µ
s
tw11 Pulse duration, logic bit 1 for IN See Figure 3-7 135 5 x tc 150
µ
s
tw12 Pulse duration, logic bit 0 for IN See Figure 3-7 945 7 x tw10 1050
µ
s