Advance Information
MT88L89
AC Electrical Characteristics†- MPU Interface - Voltages are with respect to ground (VSS), unless otherwise stated.
‡
Characteristics
Sym
Min
Typ
Max
Units
Conditions
Figure 15
1
2
3
4
5
6
7
8
9
DS/RD/WR clock frequency
DS/RD/WR cycle period
DS/RD/WR low pulse width
DS/RD/WR high pulse width
DS/RD/WR rise and fall time
R/W setup time
fCYC
tCYC
tCL
4.0
250
150
100
20
0
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Figure 15
Figure 15
tCH
Figure 15
tR,tF
tRWS
tRWH
tAS
Figure 15
Figures 16 & 17
Figures 16 & 17
Figures 16 - 19
Figures 16 - 19
Figures 16 - 19
Figures 16 - 19
Figures 16 - 19
Figures 16 - 19
Figures 16 - 19
Figures 16 - 19
R/W hold time
26
0
Address setup time (RS0)
Address hold time (RS0)
tAH
26
22
80
35
10
45
40
10 Data hold time (read)
11 DS/RD to valid data delay (read)
12 Data setup time (write)
13 Data hold time (write)
14 Chip select setup time
15 Chip select hold time
tDHR
tDDR
tDSW
tDHW
tCSS
tCSH
† Characteristics are over recommended operating conditions unless otherwise stated
‡ Typical figures are at 25°C, VDD=3V, 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.
tCYC
tR
tF
tCH
tCL
DS/RD/WR
Figure 15 - DS/RD/WR Clock Pulse
4-141
MITEL [ MITEL NETWORKS CORPORATION ]
