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AmZ8121
Eight-Bit Equal-To Comparator
DISTINCTIVE CHARACTERISTICS
• 8-bit byte oriented equal-to comparator
• Cascadable using EIN
• High-speed, Low-Power Schottky technology
• tpd A0 8 to ~OUT in 9ns
• Standard 20-pin package
• 100% product assurance screening to MIL-STD-883
requirements
FUNCTIONAL DESCRIPTION
The AmZ8121 is an 8-bit "equal to" comparator capable to
comparing two 8-bit words for "equal to" with provision
for expansion or external enabling. The matching of the two
8-bit inputs plus a logic LOW on the EIN produces an active
LOW on the output EOUT.
The logic expression for the device can be expressed as:
EOUT = (AO (8 0) fA1 (8 1) (A2 (8 2) (A3 (83) (A4 0 B4)
(AS 0 85) (A7 (87) EIN. It is obvious that the expression is
valid where AO - A7 and BO - B7 are expressed as either
assertions or negations. This is also true for pair of terms i.e.
AO can be compared with BO at the same time 1\1 is compared
with 81. It is only essential that the polarity of the paired
terms be maintained.
LOGIC DIAGRAM
::~
:;~
::~
::~
::~
::~
::~
:;~
ErN
CONNECTION DIAGRAM
EOUT
LOGIC SYMBOL
BLI·l84
18 17 16 15 14 13 12 11 9 8 7 6 5 4 3 2
Note: Pin 1 is marked for orientation
BLI·1B5
8-18
AmZ8121 8~BrT COMPARATOR
19
Vee = Pin 20
GND = Pin 10
BLI-l86

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ElECTR ICAl CHARACTER ISTICS
The Following Conditions Apply Unless Otherwise Specified:
eOM'L T A = oOe to +7oo e
Vee = 5.0V ±5% MIN. =4.75V
MIL TA=-55Q eto+125°e Vee = 5.0V ±10% MIN. = 4.50V
MAX. = 5.25V
MAX. = 5.50V
DC CHARACTERISTICS OVER OPERATING RANGE
Parameters
Description
Test Conditions (Note 1)
VOH
Output HIGH Voltage
VCC = MIN.
IOH = -4401JA
VIN = VIH or VIL
VOL
Output LOW Voltage
VCC = MIN.
VIN = VIH or VIL
IOL =4.0mA
IOL =8.0mA
IOL = 12mA
VIH
Input HIGH Level
Guaranteed input logical HIGH
voltage for all inputs
MIL
COM'L
VIL Input LOW Level
Guaranteed input logical LOW
voltage for all inputs
MIL
COM'L
VI Input Clamp Voltage
VCC = MIN.,IIN = -18mA
AmZ8121
Min.
2.5
2.7
2.0
Typ.
(Note 2)
Max.
0.4
0.45
0.5
0.7
0.8
-1.5
Units
Volts
Volts
Volts
Volts
Volts
IlL Input LOW Current
VCC=MAX., VIN =O.4V
11H Input HIGH CUrrent
VCC = MAX., VIN = 2.7V
II Input HIGH Current
VCC = MAX., VIN = 7.0V
ISC
Output Short Circuit Current
VCC = MAX.
(Note 3)
ICC
Power Supply Current
(Note 4)
VCC = MAX.
Ai, Bj
E
Aj, Bj
E
Aj, Bj
E"
-15'
-0.36
-0.72
20
40
0.1
0.2
-85
mA
IJA
mA
mA
27 40 mA
Notes: 1. For conditions shown as MIN. or MAX., use the appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical limits are at VCC = 5.0V, 25°C ambient and maximum loading.
3. Not more than one output should be shorted at a time. Duration of the short circuit test should not exceed one second.
4. E"= GND, all other inputs and outputs ope~.
MAXIMUM RATINGS (Above which the useful life may be impaired)
Storage Temperature
Temperature (Ambient) Under Bias
Supply Voltage to Ground Potential Continuous
DC Voltage Applied to Outputs for High Output State
DC Input Voltage
DC Output Current, Into Outputs
DC Input Current
8-19
-O.5V to +7.0V
-O.5V to +V CC max.
-O.5V to +7.0V
30mA
-30mA to +5.0mA

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AmZ8121
SWITCHING CHARACTERISTICS
(TA = +25°C, Vee = 5.0V)
Parameters
tpLH
tpHL
tpLH
tpHL
Description
Aj or Bj to Equal
E to Equal
Min.
Typ.
9
9
5
6
Max.
15
15
7
8
Units
ns
ns
Test Conditions
CL = 15pF
RL = 2.0kO
SWITCHING CHARACTERISTICS
OVER OPERATING RANGE*
Parameters
tpLH
tpHL
tpLH
tpHL
Description
Aj or Bj to
Equal Output
E to Equal Output
COM'L
TA = O°C to +70°C
V ce = 5.0V ±5%
Min.
Max.
20
19
10.5
12.5
MIL
TA = -55°C to +125°C
Vee = 5.0V ±10%
Min.
Max.
22
21
12
15
* AC performance over the operating temperature range is guaranteed by testing defined in Group A. Subgroup 9.
Units Test Conditions
ns
CL = 50pF
RL = 2.0kO
ns
DEFINITION OF FUNCTIONAL TERMS
Ao-A7
BO-B7
EIN
EOUT
A input to comparator
B input to comparator
Enable active LOW
EQUAL output active LOW
LOW-POWER SCHOTTKY INPUT/OUTPUT
CURRENT INTERFACE CONDITIONS
METALLIZATION AND PAD LAYOUT
Vee
20 vcc
19 EOUT
18 B7
a - I l t - - - 17 A7
1S BS
,• .-+--- 1S AS
'• . - + - - 14 BS
~I.~-- 13 AS
~~~~~gll~~~~t~'-+--- 12 B4
10 GND
DRIVING OUTPUT
DRIVEN INPUT
[J
I
':'
':'
DIE SIZE 0.063" x 0.074"
8-20
Note: Aetual current flow direction shown.
BLI-187

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APPLICATIONS
MICROPROCESSOR ENABLE CONTROLLED,
SELECTABLE, ADDRESS DECODER
ArnZ8121
AO
AO
Al
Al
A2
A2
A3
A3
A4
A4
A5
A5
Ae
Ae
A7
A7
EIN
BO
Bl
B2
B3
B4
B5
Be
AS EOUT
AO BO
Ag
Al
Bl
A10
A2
B2
All
A3
B3
A12
A4
B4
A13
A5
B5
A14 As
Be
A15
A7
B7
EIN
WRITE ENABLE.
READ ENABLE
OR BOTH
ADDRESS SELECT
ENABLE TERM
MAX. ENABLE (HIGH-to-LOW) DELAY
OVER 16-BITS
(Commercial Range)
tpHL
tpHL
Aj or Bj
to EOUT
E"IN to
EOUT
Total
19ns
12.5ns
31.5ns
STATUS LINE DECODING
AmZ8002
N/S
ST3
ST2
ST,
STo
os
A7 EO B7
As Bs
As Bs
B4
Amzal2l
A4
A3 B3
A2 B2
A, B,
Ao Bo
EIN
I/O REFERENCE
ENABLE
.H
BLI-laa
ED
8·21
BLI-la9