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DATA BULLETIN
MX663 Call Progress Decoder
PRELIMINARY INFORMATION Features
* Worldwide Call Progress Tone Decoding: Single and Dual Tones Fax and Modem Answer/Originate Tones SIT (Special Information Tones) Fast `US Busy' Tone Detector * Adjustable Detection Threshold * Voice Detector * Low Power 3.3V/5.0V Operation
Applications
* Call Progress Monitoring Automatic Call Placement * Machine Dialing * Fax Tone Detection for Line Switching
MX663
CALL PROGRESS DECODER
LINE INTERFACE
C
DTMF CODEC
RINGING CURRENT GENERATOR/ DETECTOR AND LINE REVERSAL DETECTOR
AUDIO PROCESSING
KEYBOARD AND DISPLAY DRIVER
The MX663 decodes the standard audible tone signals provided by telecom systems worldwide to indicate Dial, Ringing, Busy, Unobtainable and other stages of a call attempt. It provides the key features needed for intelligent, full-function, call progress monitoring by applications involving machine dialing or automatic call placement. The MX663 also incorporates the following features: * Single and dual tone decoding for better cross-system Call Progress monitoring. * "US Busy" tone detector, saving time needed for "cadence verification" under Busy and Unobtainable conditions. This incorporates a separate 620Hz detector for improved response. * A detector to indicate speech and non-call progress signals; this reduces voice falsing of call progress tones and adds Voice-Answer detection as a "connected" prompt. * A fax and modem tone decoder. * A separate, adjustable threshold, signal-level detector which reduces noise falsing. The MX663 uses digital signal processing techniques to provide these advantages. It is a low cost, low power product with superior performance. The MX663 may be used with a 3.0 to 5.5 volt supply and is available in the following packages: 16-pin SOIC (MX663DW) or 16-pin PDIP (MX663P).
(c) 1999 MX-COM Inc.
www.mxcom.com Tele: 800 638-5577 336 744-5050
Fax: 336 744-5054
Doc. # 20480165.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
Call Progress Decoder
2
MX663 Preliminary Information
CONTENTS
Section Page
1. Block Diagram................................................................................................................ 3 2. Signal List....................................................................................................................... 4 3. External Components.................................................................................................... 5 4. General Description....................................................................................................... 6
4.1 4.2 4.3 Overall Function Description ............................................................................................... 6 Glossary .............................................................................................................................. 6 Block Diagram Description (Reference Figure 1) ................................................................ 6
4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 4.3.6 4.3.7 SIGIN...................................................................................................................................... 6 Call Progress Detector: Signal Analyzer ................................................................................ 7 620Hz Detector ...................................................................................................................... 7 Control and Output Logic ...................................................................................................... 7 Level Detector and OPAMP ................................................................................................... 7 Xtal/Clock Oscillator ............................................................................................................... 7 Decode Output Truth Table.................................................................................................... 8
5. Application ..................................................................................................................... 9
5.1 5.2 5.3 General................................................................................................................................ 9 Signal Category Reference ................................................................................................. 9 Typical Response .............................................................................................................. 10
6. Performance Specification.......................................................................................... 11
6.1 Electrical Performance ...................................................................................................... 11
6.1.1 6.1.2 6.1.3 Absolute Maximum Ratings.................................................................................................. 11 Operating Limits ................................................................................................................... 11 Operating Characteristics..................................................................................................... 12
6.2 6.3
Timing................................................................................................................................ 13 Packaging.......................................................................................................................... 16
MX COM, Inc. reserves the right to change specifications at any time and without notice.
(c) 1999 MX-COM Inc.
www.mxcom.com Tele: 800 638-5577 336 744-5050
Fax: 336 744-5054
Doc. # 20480165.003
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All trademarks and service marks are held by their respective companies.
Call Progress Decoder
3
MX663 Preliminary Information
1. Block Diagram
VBIAS
C7
R3
VDD
VDD
ENABLE
D1
D0
D2
IRQ
D3
VDD
VSS X1 C1
C6
CONTROL AND OUTPUT LOGIC
LEVEL DETECTOR
620Hz DETECTOR
SIGNAL ANALYZER
OPAMP
XTAL/CLOCK
AMPOUT
SIGIN
(Components shown for unbalanced input)
R2
C5
VBIAS
C3
R1
SIGNAL
C4
Figure 1: Block Diagram
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C2
XTAL
IN+
IN-
CLOCK OSCILLATOR AND DIVIDERS
MX663
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VBIAS
CS
Call Progress Decoder
4
MX663 Preliminary Information
2. Signal List
Pin No. 1 2 3 4 5 6 Signal Type output input output Description Inverted output of the on-chip oscillator. Input to the on-chip oscillator, for external Xtal circuit or clock. D3, D2, D1 and D0 is a 4-bit parallel data word output to the C. The transmission of data is under the control of the CS input. These 3state outputs are held at high impedance when CS is at "1". See Figure 8 If CS is permanently at "0", D3, D2, D1 and D0 are permanently active. See Figure 4 and Figure 7. 7
XTAL XTAL/CLOCK D3 D2 D1 D0
CS
input
The chip select pin activates the Data Bus "D0: 3" when held low. A C can provide this input to allow the MX663 to reside on a shared Data Bus. Data transfer sequences are initiated, completed or aborted by the CS signal. See Figure 8 This output indicates an interrupt condition to the C by going to a logic "0". This is a "wire-ORable" output, enabling the connection of up to 8 peripherals to 1 interrupt port on the C. This pin has a low impedance pulldown to logic "0" when active and a high-impedance when inactive. An external pullup resistor is required. If CS is permanently at "0", the interrupt condition is a logic "0" pulse. See Figure 4 and Figure 7.
8
IRQ
output
9
ENABLE
input
A low level input selects the powersave mode, all circuits are reset and disabled. D0 - D3 outputs become high impedance. A high level input enables all circuits. Negative supply (ground). Signal input. The signal to this pin should be ac coupled. The dc bias of this pin is set internally. Internally generated bias voltage, held at VDD/2 when the device is not in powersave mode, it should be bypassed to VSS by a capacitor mounted close to the device pins. In powersave mode this pin is pulled towards VSS. Non-inverting input to the on-chip amplifier. Inverting input to the on-chip amplifier. Output of the on-chip amplifier, this is internally connected to the input of the Level Detector. The positive supply rail. Levels and voltages are dependent upon this supply. This pin should be bypassed to VSS by a capacitor. Table 1: Signal List
10 11 12
VSS SIGIN VBIAS
Power input output
13 14 15 16
IN+ INAMPOUT VDD
input input output Power
(c) 1999 MX-COM Inc.
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Doc. # 20480165.003
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Call Progress Decoder
5
MX663 Preliminary Information
3. External Components
VDD C2 X1 C1
XTAL XTAL D3 D2 D1 D0 CS IRQ
1 2 3 4 5 6 7 8
16 15 14
VDD
C7 R2 C5 R1 C4
AMPOUT ININ+ VBIAS SIGIN
VSS C3
MX663
13 12 11 10 9
C6
ENABLE
VDD R3
Figure 2: Recommended External Components R1 R2 R3 C1 C2 C3 Note 3 Note 3 100k: 510k: 20k: 33pF 33pF 0.1F 10% 10% 10% 20% 20% 20% X1 Note 1, 2 3.579545MHz 100ppm C4 C5 C6 C7 Note 3 Note 3 0.1F 100pF 1.0F 1F 20% 20% 20% 20%
Table 2: Recommended External Components Notes 1. A standard Color Burst Crystal Frequency is recommended. 2. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of VDD, peak to peak. Tuning fork crystals generally cannot meet this requirement. To obtain crystal oscillator design assistance, consult your crystal manufacturer. 3. Reference section 4.3.5.
(c) 1999 MX-COM Inc.
www.mxcom.com Tele: 800 638-5577 336 744-5050
Fax: 336 744-5054
Doc. # 20480165.003
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All trademarks and service marks are held by their respective companies.
Call Progress Decoder
6
MX663 Preliminary Information
4. General Description
4.1 Overall Function Description
The MX663 consists of a Call Progress Tone Detector, a 620Hz Detector and a Level Detector. The MX663 Call Progress Tone Detector uses different tone detection methods from those commonly found with other products. Many traditional devices use a bandpass filter followed by an energy detector. The filter is usually designed to pass input signals with a frequency between about 300Hz and 700Hz, and the amplitudes of signals in this range are then checked against a level threshold. Any signal of acceptable level in this frequency band is classed as a Call Progress tone, including signals due to speech and noise. False outputs caused by speech are a common feature with these products, and background noise may lead to a stuck "detect" output. The MX663, by contrast, uses a stochastic signal processing technique based on analysis in both the frequency and time domain, with signal amplitude forming a small part in the decision process. This analysis includes checks on whether the signal has a "profile" which matches international standards for Call Progress tones, or a profile more likely to match that of speech, noise or other non-call-progress signals. It also adds checks on whether tones which include frequencies corresponding with the "US Busy" signals, Special Information Tones and Fax/Modem Tones have been detected.
4.2
Glossary
Call Progress Tones: The single and dual frequency tones in the range 350Hz to 620Hz specified widely for call progress signaling. Call Progress Band: The nominal range 340Hz to 700Hz within which the MX663 will detect Call Progress tones. The detection algorithm requires that the tones have the characteristics typical of Call Progress Tones. 620Hz Detection: The nominal range 590Hz to 650Hz. Single tones in this range, or dual tones having a material frequency component within this range (e.g. 480 + 620Hz) will be detected. Non Call Progress Signal: A signal falling within the nominal range (a) 190Hz to 895Hz, but NOT within the Call Progress Band, or (b) within the nominal range 190Hz to 895Hz, but NOT meeting the DETECTION REQUIREMENTS when the signal falls in the Call Progress Band. Subject to the duration and other characteristics of such signals, the MX663 will usually interpret these as a Non Call Progress Signal (e.g. speech or other signal activity). Special Information Tone: The nominal frequencies 950Hz or 1400Hz or 1800Hz. Fax/Modem Low Tone: The nominal frequency 1250Hz. Fax/Modem High Tone: The nominal frequency 2150Hz. Minimum Input Signal: The minimum signal level for the specified tone decoding performance. The lower level at which absence of an input signal will be registered is not specified. However, a separate signal level detector makes amplitude information available. No Signal: A signal falling outside the nominal range 180Hz to 2280Hz or the absence of an input signal. Either will be detected as a No Signal condition. Nominal: Subject to dynamic tolerances within the signal analysis process. Absolute values are not material or adverse to performance.
4.3
4.3.1
Block Diagram Description (Reference Figure 1)
SIGIN
The input signal is amplified by a self-biased inverting amplifier. The dc bias of this input is internally set at. Accordingly, the input signal should be capacitively coupled to SIGIN.
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Call Progress Decoder
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MX663 Preliminary Information
4.3.2
Call Progress Detector: Signal Analyzer
The analyzer samples the call progress signal at 9.322kHz. An external Anti-Alias Filter can be configured using the on-chip opamp. The frequency range, quality and consistency of the input signal is analyzed by this functional block. To be classified as a call progress signal the input signal frequencies should lie between 340Hz and 700Hz, the signal to noise ratio must be 16dB or greater and the signal must be consistent over a period of at least 145ms. These decode criteria are continuously monitored and the assessment is updated every 7ms. See section 4.3.5. Because the analyzer time samples the input signal (SIGIN), signals above the operating band (2300Hz) can alias, appear inband, and therefore be detected. Accordingly, applying signals above (2300Hz) should be avoided. Such signals may be inadvertently generated by other sources such as digital clocks, switching power supply, crosstalk, etc. 4.3.3 620Hz Detector The detector is designed to aid detection of "US Busy" tone. The bandwidth of the 620Hz Detector is 60Hz and the signal must be consistent over a period of at least 145ms for detection to occur. This assessment is updated every 55ms. 4.3.4 Control and Output Logic This block categorizes the nature of the signal into various decoded output states and controls the four outputs. See the Truth Table in section 4.3.7. 4.3.5 Level Detector and OPAMP The OPAMP is configured as an amplifier with external components R1, R2, C4 and C5. The level detector operates by measuring the level of the amplified input signal and comparing it with a preset threshold which is defined inside the MX663 as shown in the gain calculations below. The detector output goes to the Control and Output Logic block. The data output is gated with the level detector's output. The data output is valid only if the level detector output is true. The level detector output can be forced true by connecting IN+ to VBIAS and IN- to VSS through a 100k resistor. An interrupt is produced if the output data changes state. Gain Calculations: 1. Set gain so an input signal level is amplified above the threshold level of 250mVP-P.
Gain >
250mVP-P V IN
where VIN is the input signal level at C4 in mVP-P. In simplified form to assist with component value selection: 1. DC Gain = -R2/R1 2. C5 and R2 form a low-pass filter to attenuate out of band signals applied to SIGIN. The low pass filter's band edge is determined by the following: The recommended R2 and C5's component values are selected so than f(-3dB) = 3120Hz . f ( -3dB) = 1 2 R2 C5
3. C4 is a DC blocking capacitor, large enough to avoid affecting the AC gain in the frequency band of interest. 4. The following formula defines the ac gain as a function of frequency, R1, R2 and C5 component values. AC gain, Av(f) Av( f ) = R1 R2 1 + (2 f R2 C5)
2
4.3.6
Xtal/Clock Oscillator
If the on-chip Xtal oscillator is to be used, then external components X1, C1 and C2 are required. If an external clock source is to be used, then it should be connected to the XTAL/CLOCK input pin and the XTAL pin should be left unconnected.
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Call Progress Decoder
8
MX663 Preliminary Information
4.3.7
Decode Output Truth Table D3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 D2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 D1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 D0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Conditions No Signal Call Progress Dual Tones: Will detect 350+440, 400+450, 440+480 Hz tones Non Call Progress Signal, e.g. Voice Activity Call Progress Dual Tone including 620Hz Detection: Will detect 480+620 Hz tones Special Information Tone: Will detect 950, 1400 and 1800 Hz tones Call Progress Single Tone: Will detect 400, 425, 440 and 450 Hz tones Will detect a single tone lying outside the Call Progress Band and within the Non Call Progress signal range Call Progress Single Tone including 620Hz Detection: Will detect 600 and 620 Hz tones Fax/modem High Tone: Will detect 2100 and 2200 Hz tones Reserved for future use Reserved for future use Reserved for future use Fax/modem Low Tone: Will detect 1200 and 1300 Hz tones Reserved for future use Reserved for future use Reserved for future use Table 3: Decode Truth Table
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Doc. # 20480165.003
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Call Progress Decoder
9
MX663 Preliminary Information
5. Application
5.1 General
Apply a reset after power-up by taking the ENABLE pin low. This places the device in a powersave mode and resets the internal circuits. It also places the data word output (D0-D3) in a high impedance state, regardless of the level on the CS pin. From this mode the device can be returned to normal operation without any additional settling time, when using the component values recommended in Figure 2. The tone response times remain the same and are given in section 6.1. An interrupt is produced when the decode state is changed. This interrupt is reset by CS going to logic "0". When CS is permanently at "0", the interrupt condition is a 5 s logic "0" pulse on the IRQ pin. When CS is set to logic "1", the data word output (D0-D3) goes into a high impedance state.
5.2
Signal Category Reference
Sub-Category 0000 Not Single Tone Single Tone outside of CP band Dual Tone without 620Hz Dual Tone with 620Hz Single Tone not 620Hz Single Tone 620Hz 0X10 0010 0110 0XX1 0001 0011 0101 0111 0100 1100 1000 Output Code D3:0
Signal Category No Signal Voice and Non-Call Progress Signal Call Progress Signal
Special Information Tone (SIT Tone) FAX/MODEM Unused Codes
N/A Low High
Reserved for future use 1 0 0 1, 1 0 1 0, 1 0 1 1, 1 1 0 1, 1 1 1 0, 1 1 1 1 Table 4: Signal Category
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Call Progress Decoder
10
MX663 Preliminary Information
5.3
Typical Response
Figure 3: Typical Response Chart
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Call Progress Decoder
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MX663 Preliminary Information
6. Performance Specification
6.1
6.1.1
Electrical Performance
Absolute Maximum Ratings
Exceeding these maximum ratings can result in damage to the device. General Supply (VDD - VSS) Voltage on any pin to VSS Current VDD VSS Any other pin P / DW Packages Total Allowable Power Dissipation at TAMB = 25C Derating above 25C Storage Temperature Operating Temperature 6.1.2 Operating Limits -55 -40 800 13 125 85 mW mW/C above 25C C C -30 -30 -20 30 30 20 mA mA mA Min. -0.3 -0.3 Max. 7.0 VDD + 0.3 Units V V
Correct operation of the device outside these limits is not implied. Notes Supply (VDD - VSS) Operating Temperature Xtal Frequency Min. 3.0 -40 3.57 Max. 5.5 85 3.59 Units V C MHz
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Call Progress Decoder
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MX663 Preliminary Information
6.1.3
Operating Characteristics
For the following conditions unless otherwise specified: Xtal Frequency = 3.579545MHz (Color Burst Crystal) VDD = 3.3V to 5.0V, TAMB = 25C. 0dB = 775 mVRMS, S/N = 20dB, Noise Bandwidth = 5kHz Band Limited Gaussian Notes DC Parameters IDD all powersaved VDD = 3.3V VDD = 5.0V Logic Interface Input Logic '1' Input Logic '0' Input Leakage Current Input Capacitance Output Logic '1' Output Logic '0' 'Off' State Leakage Current AC Parameters SIGIN Pin Input Impedance Minimum Input Signal Level Input Signal Dynamic Range Level Detector Signal Level Detection Threshold OPAMP Input Impedance Voltage gain Xtal/Clock Input Pulse Width Input Impedance Gain Notes: 1. Not including any current drawn from the device pins by external circuitry. 2. Enable input at VSS, CS input at VDD. 3. 'High' or 'Low' at 100Hz input = 1 mVRMS at 1kHz 7 40.0 10.0 20.0 ns M dB 6 10.0 500 M V/V measured at AMPOUT pin 5 -19.0 dB 40.0 4 0.35 -40.0 M dB dB IOH = 120A IOL = 360A 3 90% 10% 10.0 Logic '1' or '0' -1.0 70% 30% 1.0 7.5 VDD VDD A pF VDD VDD A 1, 2 1 1 30 0.5 1.0 1 2 A mA mA Min. Typ. Max. Units
IRQ pin, D0 to D3 pins.
4. Small signal impedance over the frequency range 100Hz to 2300Hz and at 5.0V. 5. Input signal level is multiplied by the voltage gain (-R2/R1). The overall signal at AMPOUT should be larger than 250mVP-P, for VDD = 5.0V. This threshold is proportional to VDD. 6. Open loop, small signal low frequency measurements. 7. Timing for an external input to the XTAL/CLOCK pin.
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Call Progress Decoder
13
MX663 Preliminary Information
6.2
Timing
For the following conditions unless otherwise specified: Xtal Frequency = 3.579545MHz, VDD = 3.3V to 5.0V, TAMB = 25C. Parameter tRP tDRP tNRP tNDRP tI tL tGI tGD tNG tDI tDE tHIZ tIR tIP Notes: 1. Timing also applies to Special Information Tones and Fax/modem Tones. 2. Only applies to burst of the same frequency. 3. For Special Information Tones and Fax/Modem tones, tGI is 15ms maximum. 4. If the gap > 90ms, a NO Signal state will be detected. Call Progress Tone Response Time Call Progress Tone De-response Time Non Call Progress Signal Response Time Non Call Progress Signal De-response Time Burst Length Ignored Burst Length Detected Call Progress Tone Gap Length Ignored Call Progress Tone Gap Length Detected Non Call Progress Signal Gap Length Ignored Data available to Interrupt pulse " CS -Low " to Data Valid " CS -High" to Output Tri-state Interrupt Reset Time Interrupt Low Pulse 4.0 5.0 1 1 1, 2, 3, 1, 2 4 40 80 430 0.2 1.0 0.2 6.0 145 20 Notes 1 1 145 80 70 Min. Typ. Max. 145 145 Units ms ms ms ms ms ms ms ms ms s s s s s
tI
SIGIN
tL
CPTone 620Hz
tGD
CPTone 620Hz
tGI
CPTone 620Hz
No Signal Call Progress Single Tone
ENABLE Tri-state D0
tRP
tDRP
tRP
Tri-state
tDE
D1 D2 D3 CS IRQ See Note 1 "0" "0"
tHIZ
tDI
Note
tDI
tIP
1. D2 is '1' only when the Call Progress signal, or a Non Call Progress signal, is a single frequency tone. Figure 4: Timing Diagram: Call Progress Tone(s)
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Call Progress Decoder
14
MX663 Preliminary Information
tI
SIGIN ENABLE Tri-state D0 D1 D2 D3 CS IRQ See Note 1 "0" "0" "0" No Signal
tL
Non Call Progress Signal
tNG
Non Call Progress Signal
tNRP tDE
tNDRP
tDI
Note:
tIP
1. D2 is '1' only when the Call Progress signal, or a Non Call Progress signal, is a single frequency tone. Figure 5: Timing Diagram: Non Call Progress Signal
tI
SIGIN No Signal
tL
Special Information Tone Special Information Tone
tGD
Special Information Tone
tGI
Special Information Tone
ENABLE Tri-state D0 D1 "0" "0" Tri-state
tDE
D2 D3 CS IRQ "0" "0"
tRP
tDRP
tRP
tHIZ
tDI
tDI
tIP
Figure 6: Timing Diagram: Special Information Tones
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Call Progress Decoder
15
MX663 Preliminary Information
tI
SIGIN No Signal
tL
Fax/Modem Low Tone Fax/Modem High Tone
tGD
Fax/Modem High Tone
tGI
Fax/Modem High Tone
ENABLE D0 D1 D2 Tri-state "0" Tri-state
tDE
"0"
tHIZ tRP tDRP tRP
D3 CS IRQ "0"
tDI
tDI
tIP
Figure 7: Timing Diagram: Fax/Modem Tones
SIGIN
No Signal
Call Progress Signal
ENABLE
tRP
CS IRQ
tDRP
tDI
D0 to D3 Tri-State
tIR
Tri-State
tDI
tDE
tHIZ
Figure 8: Bus Timing
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Call Progress Decoder
16
MX663 Preliminary Information
6.3
Packaging
Package Tolerances
A Z B E W L PIN 1 X Y C H J P K T
DIM. A B C E H J K L P T W X Y Z MIN. TYP. MAX.
0.413 (10.49) 0.395 (10.03) 0.299 (7.59) 0.286 (7.26) 0.093 (2.36) 0.105 (2.67) 0.390 (9.90) 0.419 (10.64) 0.003 (0.08) 0.020 (0.51) 0.013 (0.33) 0.020 (0.51) 0.041 (1.04) 0.016 (0.41) 0.050 (1.27) 0.050 (1.27) 0.009 (0.23) 0.0125 (0.32) 45 0 10 5 7 5
ALTERNATIVE PIN LOCATION MARKING
NOTE : All dimensions in inches (mm.) Angles are in degrees
Figure 9: 16-pin SOIC Mechanical Outline: Order as part no. MX663DW
A
DIM. A B C E E1 H J J1 K L P T Y
Package Tolerances
MIN. TYP. MAX.
0.810 (20.57) 0.740 (18.80) 0.262 (6.63) 0.240 (6.10) 0.135 (3.43) 0.200 (5.06) 0.300 (7.62) 0.390 (9.91). 0.290 (7.37) 0.325 (8.26) 0.015 (0.38) 0.070 (1.77) 0.014 (0.35) 0.023 (0.58) 0.040 (1.02) 0.065 (1.65) 0.056 (1.42) 0.064 (1.63) 0.121 (3.07) 0.150 (3.81) 0.100 (2.54) 0.008 (0.20) 0.015 (0.38) 7
B
E1 Y
E
PIN 1
T
K H L J J1 P
C
NOTE : All dimensions in inches (mm.) Angles are in degrees
Figure 10: 16-pin PDIP Mechanical Outline: Order as part no. MX663P
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CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CML Product Data
In the process of creating a more global image, the three standard product semiconductor companies of CML Microsystems Plc (Consumer Microcircuits Limited (UK), MX-COM, Inc (USA) and CML Microcircuits (Singapore) Pte Ltd) have undergone name changes and, whilst maintaining their separate new names (CML Microcircuits (UK) Ltd, CML Microcircuits (USA) Inc and CML Microcircuits (Singapore) Pte Ltd), now operate under the single title CML Microcircuits. These companies are all 100% owned operating companies of the CML Microsystems Plc Group and these changes are purely changes of name and do not change any underlying legal entities and hence will have no effect on any agreements or contacts currently in force. CML Microcircuits Product Prefix Codes Until the latter part of 1996, the differentiator between products manufactured and sold from MXCOM, Inc. and Consumer Microcircuits Limited were denoted by the prefixes MX and FX respectively. These products use the same silicon etc. and today still carry the same prefixes. In the latter part of 1996, both companies adopted the common prefix: CMX. This notification is relevant product information to which it is attached. CML Microcircuits (USA) [formerly MX-COM, Inc.] Product Textual Marking On CML Microcircuits (USA) products, the `MX-COM' textual logo is being replaced by a `CML' textual logo.
Company contact information is as below:
CML Microcircuits (UK)Ltd
COMMUNICATION SEMICONDUCTORS
CML Microcircuits (USA) Inc.
COMMUNICATION SEMICONDUCTORS
CML Microcircuits (Singapore)PteLtd
COMMUNICATION SEMICONDUCTORS
Oval Park, Langford, Maldon, Essex, CM9 6WG, England Tel: +44 (0)1621 875500 Fax: +44 (0)1621 875600 uk.sales@cmlmicro.com www.cmlmicro.com
4800 Bethania Station Road, Winston-Salem, NC 27105, USA Tel: +1 336 744 5050, 0800 638 5577 Fax: +1 336 744 5054 us.sales@cmlmicro.com www.cmlmicro.com
No 2 Kallang Pudding Road, 09-05/ 06 Mactech Industrial Building, Singapore 349307 Tel: +65 7450426 Fax: +65 7452917 sg.sales@cmlmicro.com www.cmlmicro.com
D/CML (D)/2 May 2002

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