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LOGIC Devices Incorporated
LOGIC Devices Incorporated


L10C11

4/8-bit Variable Length Shift Register



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L10C11 pdf
DEVICES INCORPORATED
DEVICES INCORPORATED
L10C11
L10C114/8-bit Variable Length Shift Register
4/8-bit Variable Length Shift Register
FEATURES
DESCRIPTION
u Variable Length 4 or 8-bit Wide
Shift Register
u Selectable Delay Length from 3 to
18 Stages
u Low Power CMOS Technology
u Replaces Fairchild TMC2011
u Load, Shift, and Hold Instructions
u Separate Data In and Data Out Pins
u Package Styles Available:
• 24-pin Plastic DIP
• 28-pin Plastic LCC, J-Lead
The L10C11 is a high-speed, low
power CMOS variable length shift
register. The L10C11 consists of two
4-bit wide, adjustable length shift
registers. These registers share control
signals and a common clock. Both
shift registers can be programmed
together to any length from 3 to 18
stages inclusive, or one register can be
fixed at 18 stages of delay while the
other is variable. The configuration
implemented is determined by the
Length Code (L3-0) and the MODE
control line as shown in Table 1.
Each input is applied to a chain of
registers which are clocked on the
rising edge of the common CLK input.
These registers are numbered R1
through R17 and R1’ through R17’,
corresponding to the D3-0 and D7-4
data fields respectively. A multi-
plexer serves to route the contents of
any of registers R2 through R17 to the
output register, denoted R18. A
similar multiplexer operates on the
contents of R2’ through R17’ to load
R18’. Note that the minimum-length
path from data inputs to outputs is R1
to R2 to R18, consisting of three stages
of delay.
The MODE input determines whether
one or both of the internal shift
registers have variable length. When
MODE = 0, both D3-0 and D7-4 are
delayed by an amount which is
controlled by L3-0. When MODE = 1,
the D7-4 field is delayed by 18 stages
independent of L3-0.
The Length Code (L3-0) controls the
number of stages of delay applied to
the D inputs as shown in Table 1.
When the Length Code is 0, the inputs
are delayed by 3 clock periods. When
the Length Code is 1, the delay is 4
clock periods, and so forth. The
Length Code and MODE inputs are
latched on the rising edge of CLK.
Both the Length Code and MODE
values may be changed at any time
without affecting the contents of
registers R1 through R17 or R1’
through R17’.
L10C11 BLOCK DIAGRAM
D3-0
CLK
L3-0
4
4
R17
R16
R15
4
Y3-0
R4
R3
R2
MODE
D7-4
4
R17’
R16’
R15’
R4’
R3’
R2’
4
Y7-4
Pipeline Registers
1 03/27/2000–LDS.11-L



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L10C11 pdf
DEVICES INCORPORATED
L10C11
4/8-bit Variable Length Shift Register
TABLE 1. CONTROL ENCODING
Length Code Mode = 0 Mode = 1
Delay
Delay
L3 L2 L1 L0 Y3-0 Y7-4 Y3-0 Y7-4
00
00
00
00
01
01
01
01
10
10
10
10
11
11
11
11
00
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
33
44
55
66
77
88
99
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
3 18
4 18
5 18
6 18
7 18
8 18
9 18
10 18
11 18
12 18
13 18
14 18
15 18
16 18
17 18
18 18
MAXIMUM RATINGS
Above which useful life may be impaired (Notes 1, 2, 3, 8)
Storage temperature ..................................................... –65°C to +150°C
Operating ambient temperature ..................................... –55°C to +125°C
VCC supply voltage with respect to ground ...................... –0.5 V to +7.0 V
Input signal with respect to ground .................................. –3.0 V to +7.0 V
Signal applied to high impedance output ......................... –3.0 V to +7.0 V
Output current into low outputs ....................................................... 25 mA
Latchup current ......................................................................... > 400 mA
OPERATING CONDITIONS
To meet specified electrical and switching characteristics
Mode
Active Operation, Com.
Active Operation, Mil.
Temperature Range
0°C to +70°C
–55°C to +125°C
Supply Voltage
4.75 V £ VCC £ 5.25 V
4.50 V £ VCC £ 5.50 V
ELECTRICAL CHARACTERISTICS Over Operating Conditions (Note 4)
Symbol Parameter
Test Condition
VOH Output High Voltage
VCC = Min., IOH = –12 mA
VOL Output Low Voltage
VCC = Min., IOL = 24 mA
VIH Input High Voltage
VIL Input Low Voltage
(Note 3)
IIX Input Current
Ground VIN VCC (Note 12)
ICC1 VCC Current, Dynamic
(Notes 5, 6)
ICC2 VCC Current, Quiescent (Note 7)
Min Typ Max Unit
2.4 V
0.5 V
2.0 VCC V
0.0 0.8 V
±20 µA
10 20 mA
1.0 mA
Pipeline Registers
2 03/27/2000–LDS.11-L



Part Number L10C11
Description 4/8-bit Variable Length Shift Register
Maker LOGIC Devices Incorporated - LOGIC Devices Incorporated
Total Page 6 Pages
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