MT8888C データシートの表示（PDF） - Mitel Networks
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MT8888C Datasheet PDF : 16 Pages
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MT8888C/MT8888C-1
AC Electrical Characteristics†- MPU Interface - Voltages are with respect to ground (VSS), unless otherwise stated.
Characteristics
Sym Min Typ‡ Max Units
Conditions
1 RD/WR clock frequency
fCYC
4.0
MHz Figure 16
2 RD/WR cycle period
tCYC
250
ns Figure 16
3 RD/WR rise and fall time
tR, tF
20
ns Figure 16
4 Address setup time
tAS
23
ns Figures 17 & 18
5 Address hold time
tAH
26
ns Figures 17 & 18
6 Data hold time (read)
tDHR
22
ns Figures 17 & 18
7 RD to valid data delay (read)
tDDR
100 ns Figures 17 & 18
8 RD, WR pulse width low
tPWL
150
ns Figures 16, 17 & 18
9 RD, WR pulse width high
tPWH
100
ns Figures 16, 17 & 18
10 Data setup time (write)
tDSW
45
ns Figures 17 & 18
11 Data hold time (write)
tDHW
10
ns Figures 17 & 18
12 Input Capacitance (data bus)
CIN
5
pF
13 Output Capacitance (IRQ/CP)
COUT
5
pF
† Characteristics are over recommended operating conditions unless otherwise stated
‡ Typical figures are at 25°C, VDD=5V, and for design aid only: not guaranteed and not subject to production testing
NOTES: 1) dBm=decibels above or below a reference power of 1 mW into a 600 ohm load.
2) Digit sequence consists of all 16 DTMF tones.
3) Tone duration=40 ms. Tone pause=40 ms.
4) Nominal DTMF frequencies are used.
5) Both tones in the composite signal have an equal amplitude.
6) The tone pair is deviated by ± 1.5%±2 Hz.
7) Bandwidth limited (3 kHz) Gaussian noise.
8) The precise dial tone frequencies are 350 and 440 Hz (±2%).
9) Guaranteed by design and characterization. Not subject to production testing.
10) Referenced to the lowest amplitude tone in the DTMF signal.
11) For guard time calculation purposes.
4-105
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