LOGIC L10C11PC20, L10C11JC15, L10C11PC15, L10C11JC20 Datasheet

DEVICES INCORPORATED

L10C11

4/8-bit Variable Length Shift Register

Pipeline Registers

03/27/2000–LDS.11-L

1

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❑ Variable Length 4 or 8-bit Wide

Shift Register

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❑ Selectable Delay Length from 3 to

18 Stages

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❑ Low Power CMOS Technology
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❑ Replaces Fairchild TMC2011
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❑ Load, Shift, and Hold Instructions
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❑ Separate Data In and Data Out Pins
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❑ Package Styles Available:

• 24-pin Plastic DIP

• 28-pin Plastic LCC, J-Lead

FEATURES DESCRIPTION

L10C11

4/8-bit Variable Length Shift Register

DEVICES INCORPORATED

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 multi­plexer 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

REGISTER R1

REGISTER R2

REGISTER R3

REGISTER R15

REGISTER R16

REGISTER R17

L REGISTER

D

3-0

4

REGISTER R1’

REGISTER R2’

REGISTER R3’

REGISTER R15’

REGISTER R16’

REGISTER R17’

D

7-4

4

L

3-0

MODE

4

CLK

R17
R16
R15

R4
R3
R2

MUX

REGISTER R18

4

Y

3-0

REGISTER R18’

4

Y

7-4

R17’
R16’
R15’

R4’
R3’
R2’

MUX

DEVICES INCORPORATED

L10C11

4/8-bit Variable Length Shift Register

Pipeline Registers

03/27/2000–LDS.11-L

2

Length Code Mode = 0 Mode = 1

Delay Delay

L3 L2 L1 L0 Y3-0 Y7-4 Y3-0 Y7-4

0000 33 318
0001 44 418
0010 55 518
0011 66 618
0100 77 718
0101 88 818
0110 99 918
0 1 1 1 1010 1018
1 0 0 0 1111 1118
1 0 0 1 1212 1218
1 0 1 0 1313 1318
1 0 1 1 1414 1418
1 1 0 0 1515 1518
1 1 0 1 1616 1618
1 1 1 0 1717 1718
1 1 1 1 1818 1818

TABLE 1. CONTROL ENCODING

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

MAXIMUM RATINGS

Above which useful life may be impaired (Notes 1, 2, 3, 8)

OPERATING CONDITIONS

To meet specified electrical and switching characteristics

Symbol Parameter Test Condition Min Typ Max Unit

VOH Output High Voltage VCC = Min., IOH = –12 mA 2.4 V
VOL Output Low Voltage VCC = Min., IOL = 24 mA 0.5 V
VIH Input High Voltage 2.0 VCC V
VIL Input Low Voltage (Note 3) 0.0 0.8 V
IIX Input Current Ground ≤ VIN ≤ VCC (Note 12) ±20 µA
ICC1 VCC Current, Dynamic (Notes 5, 6) 10 20 mA
ICC2 VCC Current, Quiescent (Note 7) 1.0 mA

ELECTRICAL CHARACTERISTICS

Over Operating Conditions (Note 4)

Mode Temperature Range Supply Voltage

Active Operation, Com. 0°C to +70°C 4.75 V £ VCC £ 5.25 V

Active Operation, Mil. –55°C to +125°C 4.50 V £ VCC £ 5.50 V