MT8885 Mitel Networks Corporation, MT8885 Datasheet - Page 17

• Manufacturer Part Number: MT8885
• Description: Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
• Manufacturer: Mitel Networks Corporation

Advance Information
† Characteristics are over recommended operating conditions unless otherwise stated
‡ Typical figures are at 25°C, V
NOTES: 1) dBm=decibels above or below a reference power of 1 mW into a 600 ohm load.
AC Electrical Characteristics
10
11
12
13
14
15
16
17
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
R/W hold time
Address setup time (RS0)
Address hold time (RS0)
Data hold time (read)
DS/RD to valid data delay (read)
Data setup time (write)
Data hold time (write)
Chip select setup time
Chip select hold time
Input Capacitance (data bus)
Output Capacitance (IRQ/CP)
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.
DS/RD/WR
Characteristics
DD
=5V, and for design aid only: not guaranteed and not subject to production testing
†
- MPU Interface
Figure 15 - DS/RD/WR Clock Pulse
t
R
C
Sym
t
t
t
t
t
t
f
t
t
t
t
t
RWS
RWH
DSW
DHW
C
CYC
CYC
t
t
DHR
DDR
CSH
R,
CSS
CH
OUT
t
AS
AH
CL
IN
t
F
t
CH
Min
150
- Voltages are with respect to ground (V
23
20
40
22
45
10
45
40
0
t
CYC
Typ
t
250
100
4.0
F
20
35
5
5
‡
Max
100
20
t
CL
Units
MHz
pF
pF
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
SS
Figure 15
Figure 15
Figure 15
Figure 15
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
), unless otherwise stated.
Conditions
MT8885
4-67