MT8888CE1 Zarlink, MT8888CE1 Datasheet - Page 21

• Manufacturer Part Number: MT8888CE1
• Description: DTMF TXRX 3.58MHz CMOS 5V 20-Pin PDIP Tube
• Manufacturer: Zarlink

Specifications of MT8888CE1

• Package: 20PDIP
• Operating Frequency: 3.58 MHz
• Typical Supply Current: 7 mA
• Typical Operating Supply Voltage: 5 V
• Minimum Operating Supply Voltage: 4.75 V
• Maximum Operating Supply Voltage: 5.25 V

AC Electrical Characteristics
† 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.
13
WR
CS, RS0
DATA BUS
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.
Output Capacitance (IRQ/CP)
RD/WR
Characteristics
°
C, V
DD
=5 V, and for design aid only: not guaranteed and not subject to production testing
†
- MPU Interface (continued)-
Figure 20 - 8031/8051/8085 Write Timing Diagram
Figure 19 - 8031/8051/8085 Read Timing Diagram
t
t
AS
AS
Figure 18 - RD/WR Clock Pulse
t
DDR
Zarlink Semiconductor Inc.
t
R
Sym.
C
t
t
PWL
OUT
PWL
MT8888C
21
t
PWH
t
DSW
Min.
t
CYC
Voltages are with respect to ground (V
t
AH
Typ.
t
t
t
AH
DHW
F
5
t
DHR
‡
Max.
t
PWL
t
t
PWH
PWH
Units
pF
SS
Conditions
), unless otherwise
Data Sheet