MT8888C Zarlink Semiconductor, MT8888C Datasheet - Page 21

• Manufacturer Part Number: MT8888C
• Description: Integrated DTMF Transceiver with Intel Micro Interface
• Manufacturer: Zarlink Semiconductor

AC Electrical Characteristics
- Voltages are with respect to ground (V
† Characteristics are over recommended operating conditions unless otherwise stated
‡ Typical figures are at 25
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12
13
11
RD
CS, RS0
DATA BUS
dBm=decibels above or below a reference power of 1 mW into a 600 ohm load.
Digit sequence consists of all 16 DTMF tones.
Tone duration=40 ms. Tone pause=40 ms.
Nominal DTMF frequencies are used.
Both tones in the composite signal have an equal amplitude.
The tone pair is deviated by ± 1.5%±2 Hz.
Bandwidth limited (3 kHz) Gaussian noise.
The precise dial tone frequencies are 350 and 440 Hz (±2%).
Guaranteed by design and characterization. Not subject to production testing.
Referenced to the lowest amplitude tone in the DTMF signal.
For guard time calculation purposes.
Data hold time (write)
Input Capacitance (data bus)
Output Capacitance (IRQ/CP)
RD/WR
Characteristics
°
C, V
DD
=5V, and for design aid only: not guaranteed and not subject to production testing
†
SS
- MPU Interface (continued)
Figure 19 - 8031/8051/8085 Read Timing Diagram
), unless otherwise stated.
t
AS
Figure 18 - RD/WR Clock Pulse
t
DDR
Zarlink Semiconductor Inc.
t
R
C
Sym
t
DHW
C
t
OUT
PWL
MT8888C
IN
21
t
PWH
Min
10
t
CYC
t
AH
Typ
t
F
5
5
t
DHR
‡
Max
t
PWL
t
PWH
Units
pF
pF
ns
Figures 19 & 20
Conditions
Data Sheet