MT8889C/MT8889C-1
AC Electrical Characteristics†- MPU Interface - Voltages are with respect to ground (VSS), unless otherwise stated.
‡
Characteristics
Sym
Min
Typ
Max
Units
Conditions
Figure 16
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
f
t
4.0
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
pF
pF
CYC
250
Figure 16
CYC
t
150
Figure 16
CL
t
100
Figure 16
CH
t t
20
Figure 16
R, F
t
23
20
0
Figures 17 & 18
Figures 17 & 18
Figures 17 - 20
Figures 17 - 20
Figures 17 - 20
Figures 17 - 20
Figures 17 - 20
Figures 17 - 20
Figures 17 - 20
Figures 17 - 20
RWS
RWH
R/W hold time
t
Address setup time (RS0)
Address hold time (RS0)
t
AS
t
40
22
20
AH
10 Data hold time (read)
t
DHR
DDR
DSW
DHW
11 DS/RD to valid data delay (read)
12 Data setup time (write)
13 Data hold time (write)
t
100
t
45
10
45
40
t
14 Chip select setup time
t
35
CSS
CSH
15 Chip select hold time
t
16 Input Capacitance (data bus)
C
5
5
IN
17 Output Capacitance (IRQ/CP)
C
OUT
† 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.
tCYC
tR
tF
tCH
tCL
DS/RD/WR
Figure 16 - DS/RD/WR Clock Pulse
4-122
MITEL [ MITEL NETWORKS CORPORATION ]
