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Subjects (changes since last revision)
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Maximum ratings are absolute ratings; exceeding only one of these values may cause irreversible damage to the
integrated circuit.
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The listed characteristics are ensured over the operating range of the integrated circuit. Typical characteristics
specify mean values expected over the production spread. If not otherwise specified, typical characteristics apply
at TA = 25 °C and the given supply voltage.
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In the operating range the functions given in the circuit description are fullfilled.
For detailed technical information about “Processing Guidelines” and “Quality Assurance” for ICs, see our Product
Overview “ICs for Communications”
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This edition was realized using the software system FrameMaker®.
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© Siemens AG 1998. All Rights Reserved.
As far as patents or other rights of third parties are concerned, liability is only assumed for components per se, not
for applications, processes and circuits implemented within components or assemblies.
The information describes the type of component and shall not be considered as assured characteristics.
Terms of delivery and rights to change design reserved.
For questions on technology, delivery, and prices please contact the Offices of Semiconductor Group in Germany
or the Siemens Companies and Representatives worldwide. (see address list).
Due to technical requirements components may contain dangerous substances. For information on the type in
question please contact your nearest Siemens Office, Semiconductor Group.
Siemens AG is an approved CECC manufacturer.
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Preliminary Data
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The IC is designed for use in mobile radio communication
devices up to 1100 MHz.
Due to its low power consumption and low phase noise
generation it is suitable for the use in battery powered handheld
systems, e.g. GSM, cordless telephone and wireless LANs.
Low supply voltage down to 2.7V.
It can be switched to a low-power standby mode.
Bipolar IC
Vignette
3'62
Internal current source at the emitter follower output. No external resistor needed in typical
applications.
The divide ratio is 1:64/65 or 1:128/129 depending on the external circuit configuration.
The IC is board level compatible to the PMB 2312 prescaler.
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The differential inputs of the IC may be connected either balanced or single ended. In the latter case
the unused input must be RF-grounded with a capacitor (about 1.5 nF) with a low serial inductance.
Depending on the logic level at SW input the basic divide ratio of the ECL-stages is fixed to 1:64/65
or 1:128/129. The MOD input determines whether modulus 1:n or 1:n+1 (n=64 or 128 according to
SW-level) is active.
The IC can be switched to a low-power standby mode (input STB).
The MOD input is TTL/CMOS compatible.
The emitter follower output is CMOS compatible according to the application circuit on page 11. The
minimum logic swing is 0.8 V
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HIGH = U
S
-0.1 V to U
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LOW = GND to 0.8 V or open
HIGH = 2.0 V to U
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or open
LOW = GND to 0.8 V
HIGH = U
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-0.1 V to U
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LOW = GND to 0.8 V
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1:64/65
1:128/129
1:64/1:128
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Divider
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