CM8888 Datasheet, PDF (4/13 Pages) California Micro Devices Corp – CMOS INTEGRATED DTMF TRANCEIVER

CALIFORNIA MICRO DEVICES
CM8888/8888-2
AC Characteristics: V_DD = 5.0V + 5%, V_SS = OV, T_A = -40°C to +85°C
Parameter
Microprocessor Interface
RD, WR, Low Pulse Width
RD, WR, High Pulse Width
RD, WR, Rise and Fall
Address Hold
Address Setup
Read Data Hold
RD to Valid Data Delay (200 pF Load)
Write Data Setup
Write Data Hold
Input Capacitance DO-D3
Output Capacitance IRQ CP
DTMF Clock
Crystal Clock Frequency
Clock Input Rise Time (External Clk.)
Clock Input Fall Time (External Clk.)
Clock Input Duty Cycle (External Clk.)
Capacitive Load OSC2
AC CHARACTERISTICS
Symbol
Min
t_CL
t_CH
t_R, t_F
t_AH
t_AS
t_DHR
t_DDR
t_DSW
t_DHW
t_CIN
t_OUT
fc
t_LHCL
t_LHCL
D C_CL
C_LO
200
180
10
23
22
45
10
3.5759
40
Typ*
5
5
3.5795
50
Max
25
150
3.5831
110
110
60
30
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
pF
pF
MHz
ns
ns
%
pF
* Typical values are for use as design aids only, and are not guaranteed or 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 = 40mS. 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 deviate by + 1.5% + 2Hz.
7. Bandwidth limited (3 KHz) Gaussian Noise.
8. The precise dial tone frequencies are 350 and 440 Hz (+2%)
9. For an error date of less than 1 in 10,000.
10. Referenced to the lowest amplitude tone in the DTMF signal.
11. Referenced to the minimum valid accept level.
©2000 California Micro Devices Corp. All rights reserved.
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215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com
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