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參數(shù)資料
| 型號(hào)： | 933520200112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 標(biāo)準(zhǔn)邏輯 |
| 英文描述： | SPECIALTY LOGIC CIRCUIT, CDIP28 |
| 封裝： | CERAMIC, SOT-135V, DIP-28 |
| 文件頁(yè)數(shù)： | 3/10頁(yè) |
| 文件大?。?/td> | 148K |
| 代理商： | 933520200112 |
January 1995
2
Philips Semiconductors
Product specication
Universal divider
HEF4751V
LSI
DESCRIPTION
The HEF4751V is a universal divider (U.D.) intended for
use in high performance phase lock loop frequency
synthesizer systems. It consists of a chain of counters
operating in a programmable feedback mode.
Programmable feedback signals are generated for up to
three external (fast)
÷ 10/11 prescaler.
The system comprising one HEF4751V U.D. together with
prescalers is a fully programmable divider with a maximum
configuration of: 5 decimal stages, a programmable mode
M stage (1
≤ M ≤ 16, non-decimal fraction channel
selection), and a mode H stage (H = 1 or 2, stage for half
channel offset).
Programming is performed in BCD code in a bit-parallel,
digit-serial format.
To accommodate fixed or variable frequency offset, two
numbers are applied in parallel, one being subtracted from
the other to produce the internal programme.
The decade selection address is generated by an internal
programme counter which may run continuously or on
demand. Two or more universal dividers can be cascaded,
each extra U.D. (in slave mode) adds two decades to the
system. The combination retains the full programmability
and features of a single U.D. The U.D. provides a fast
output signal FF at output OFF, which can have a phase
jitter of
± 1 system input period, to allow fast frequency
locking. The slow output signal FS at output OFS, which is
jitter-free, is used for fine phase control at a lower speed.
Fig.1 Pinning diagram.
SUPPLY VOLTAGE
FAMILY DATA, IDD LIMITS category LSI
See Family Specifications
HEF4751VP(N):
28-lead DIL; plastic (SOT117)
HEF4751VD(F):
28-lead DIL; ceramic (cerdip) (SOT135V)
HEF4751VT(D):
28-lead SO; plastic (SOT136A)
( ): Package Designator North America
RATING
RECOMMENDED OPERATING
0,5 to + 18
4,5 to 12,5 V
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