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MC74AC521 MC74ACT521 8 Bit Identity Comparator
The MC74AC521/74ACT521 is an expandable 8-bit comparator. It compares two words of up to eight bits each and provides a LOW output when the two words match bit for bit. The expansion input IA=B also serves as an active LOW enable input. * * * * * Compares Two 8-Bit Words in 6.5 ns Typ Expandable to Any Word Length 20-Pin Package Outputs Source/Sink 24 mA ACT521 has TTL-Compatible Inputs
N SUFFIX CASE 738-03 PLASTIC
8-BIT IDENTITY COMPARATOR
VCC OA=B 20 19
B7 18
A7 17
B6 16
A6 15
B5 14
A5 13
B4 12
A4 11
1 IA=B
2 A0
3 B0
4 A1
5 B1
6 A2
7 B2
8 A3
9 B3
10 GND
DW SUFFIX CASE 751D-04 PLASTIC
PIN NAMES A0-A7 B0-B7 IA=B OA=B Word A Inputs Word B Inputs Expansion or Enable Input Identity Output
LOGIC SYMBOL
TRUTH TABLE
Inputs IA=B L L H H A, B A = B* AB A = B* AB Outputs OA=B L H H H B7 A7 B6 A6 B5 A5 B4 A4 B3 A3 B2 A2 B1 A1 B0 A0 IA=B OA=B
H = HIGH Voltage Level L = LOW Voltage Level *A0=B0, A1=B1, A2=B2, etc.
FACT DATA 5-1
MC74AC521 MC74ACT521
LOGIC DIAGRAM
A0 B0 A1 B1 A2 B2 A3 B3 OA=B A4 B4 A5 B5 A6 B6 A7 B7 IA=B
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
MAXIMUM RATINGS*
Symbol VCC Vin Vout Iin Iout ICC Tstg Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage (Referenced to GND) DC Output Voltage (Referenced to GND) DC Input Current, per Pin DC Output Sink/Source Current, per Pin DC VCC or GND Current per Output Pin Storage Temperature Value -0.5 to +7.0 -0.5 to VCC +0.5 -0.5 to VCC +0.5 20 50 50 -65 to +150 Unit V V V mA mA mA C
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.
FACT DATA 5-2
MC74AC521 MC74ACT521
RECOMMENDED OPERATING CONDITIONS
Symbol VCC Vin, Vout Supply Voltage DC Input Voltage, Output Voltage (Ref. to GND) VCC @ 3.0 V tr, tf Input Rise and Fall Time (Note 1) AC Devices except Schmitt Inputs VCC @ 4.5 V VCC @ 5.5 V tr, tf TJ TA IOH IOL Input Rise and Fall Time (Note 2) ACT Devices except Schmitt Inputs Junction Temperature (PDIP) Operating Ambient Temperature Range Output Current -- High Output Current -- Low -40 25 VCC @ 4.5 V VCC @ 5.5 V Parameter AC ACT Min 2.0 4.5 0 150 40 25 10 ns/V 8.0 140 85 -24 24 C C mA mA ns/V Typ 5.0 5.0 Max 6.0 5.5 VCC V Unit V
1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times. 2. Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.
DC CHARACTERISTICS
74AC Symbol Parameter VCC (V) TA = +25C Typ VIH Minimum High Level Input Voltage 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 VOL Maximum Low Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 IIN IOLD IOHD ICC Maximum Input Leakage Current Minimum Dynamic Output Current Maximum Quiescent Supply Current 5.5 5.5 5.5 5.5 8.0 0.002 0.001 0.001 1.5 2.25 2.75 1.5 2.25 2.75 2.99 4.49 5.49 74AC TA = -40C to +85C Unit Conditions
Guaranteed Limits 2.1 3.15 3.85 0.9 1.35 1.65 2.9 4.4 5.4 2.56 3.86 4.86 0.1 0.1 0.1 0.36 0.36 0.36 0.1 2.1 3.15 3.85 0.9 1.35 1.65 2.9 4.4 5.4 2.46 3.76 4.76 0.1 0.1 0.1 0.44 0.44 0.44 1.0 75 -75 80 V VOUT = 0.1 V or VCC - 0.1 V VOUT = 0.1 V or VCC - 0.1 V IOUT = -50 A V *VIN = VIL or VIH -12 mA IOH -24 mA -24 mA IOUT = 50 A V *VIN = VIL or VIH 12 mA IOL 24 mA 24 mA VI = VCC, GND VOLD = 1.65 V Max VOHD = 3.85 V Min VIN = VCC or GND
VIL
Maximum Low Level Input Voltage
V
VOH
Minimum High Level Output Voltage
V
V
A mA mA A
* All outputs loaded; thresholds on input associated with output under test. Maximum test duration 2.0 ms, one output loaded at a time. Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.
FACT DATA 5-3
MC74AC521 MC74ACT521
AC CHARACTERISTICS (For Figures and Waveforms -- See Section 3)
74AC Symbol Parameter VCC* (V) Min tPLH tPHL tPLH tPHL Propagation Delay An or Bn to OA=B Propagation Delay An or Bn to OA=B Propagation Delay IA=B to OA=B Propagation Delay IA=B to OA=B 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.5 2.5 4.5 3.0 3.0 2.5 3.0 2.0 TA = +25C CL = 50 pF Typ Max 11 8.0 11.5 8.5 8.0 6.0 8.0 6.0 74AC TA = -40C to +85C CL = 50 pF Min 3.0 2.0 3.5 2.5 2.5 2.0 2.5 2.0 Max 12 9.0 12.5 9.0 9.0 7.0 9.0 7.0 ns ns ns ns 3-6 3-6 3-6 3-6 Unit Fig. No.
* Voltage Range 3.3 V is 3.3 V 0.3 V. Voltage Range 5.0 V is 5.0 V 0.5 V.
DC CHARACTERISTICS
74ACT Symbol Parameter VCC (V) TA = +25C Typ VIH VIL VOH Minimum High Level Input Voltage Maximum Low Level Input Voltage Minimum High Level Output Voltage 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 VOL Maximum Low Level Output Voltage 4.5 5.5 4.5 5.5 IIN ICCT IOLD IOHD ICC Maximum Input Leakage Current Additional Max. ICC/Input Minimum Dynamic Output Current Maximum Quiescent Supply Current 5.5 5.5 5.5 5.5 5.5 8.0 0.6 0.001 0.001 1.5 1.5 1.5 1.5 4.49 5.49 74ACT TA = -40C to +85C Unit Conditions
Guaranteed Limits 2.0 2.0 0.8 0.8 4.4 5.4 3.86 4.86 0.1 0.1 0.36 0.36 0.1 2.0 2.0 0.8 0.8 4.4 5.4 3.76 4.76 0.1 0.1 0.44 0.44 1.0 1.5 75 -75 80 V V V VOUT = 0.1 V or VCC - 0.1 V VOUT = 0.1 V or VCC - 0.1 V IOUT = -50 A *VIN = VIL or VIH -24 mA IOH -24 mA IOUT = 50 A *VIN = VIL or VIH 24 mA IOL 24 mA VI = VCC, GND VI = VCC - 2.1 V VOLD = 1.65 V Max VOHD = 3.85 V Min VIN = VCC or GND
V
V
V
A mA mA mA A
* All outputs loaded; thresholds on input associated with output under test. Maximum test duration 2.0 ms, one output loaded at a time.
FACT DATA 5-4
MC74AC521 MC74ACT521
AC CHARACTERISTICS (For Figures and Waveforms -- See Section 3)
74ACT Symbol Parameter VCC* (V) Min tPLH tPHL tPLH tPHL Propagation Delay An or Bn to OA=B Propagation Delay An or Bn to OA=B Propagation Delay IA=B to OA=B Propagation Delay IA=B to OA=B 5.0 5.0 5.0 5.0 3.0 3.0 2.0 2.5 TA = +25C CL = 50 pF Typ Max 9.0 10 6.5 7.5 74ACT TA = -40C to +85C CL = 50 pF Min 2.5 2.5 2.0 2.0 Max 9.5 11 7.0 8.0 ns ns ns ns 3-6 3-6 3-6 3-6 Unit Fig. No.
* Voltage Range 5.0 V is 5.0 V 0.5 V.
CAPACITANCE
Symbol CIN CPD Input Capacitance Power Dissipation Capacitance Parameter Value Typ 4.5 40 Unit pF pF Test Conditions VCC = 5.0 V VCC = 5.0 V
APPLICATIONS RIPPLE EXPANSION
A0 B0 ENABLE LOW ........ A7 B7 A8 B8 ........ IA=B IA=B A15 B15 A16 B16 ........ A23 B23
IA=B
OA=B
OA=B
OA=B
PARALLEL EXPANSION
A0 B0 ENABLE LOW ........ A7 B7 A8 B8 ........ IA=B IA=B A15 B15 A16 B16 ........ A23 B23
IA=B
OA=B
OA=B
OA=B
FACT DATA 5-5
MC74AC521 MC74ACT521
OUTLINE DIMENSIONS
N SUFFIX PLASTIC DIP PACKAGE CASE 738-03 ISSUE E
11
-A-
20
B
1 10
C
L
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. INCHES MIN MAX 1.010 1.070 0.240 0.260 0.150 0.180 0.015 0.022 0.050 BSC 0.050 0.070 0.100 BSC 0.008 0.015 0.110 0.140 0.300 BSC 0_ 15 _ 0.020 0.040 MILLIMETERS MIN MAX 25.66 27.17 6.10 6.60 3.81 4.57 0.39 0.55 1.27 BSC 1.27 1.77 2.54 BSC 0.21 0.38 2.80 3.55 7.62 BSC 0_ 15_ 0.51 1.01
-T-
SEATING PLANE
K M E G F D
20 PL
N J 0.25 (0.010)
M 20 PL
0.25 (0.010) TA
M
M
TB
M
DIM A B C D E F G J K L M N
-A-
20 11
DW SUFFIX PLASTIC SOIC PACKAGE CASE 751D-04 ISSUE E
-B-
1 10
10X
P 0.010 (0.25)
M
B
M
20X
D
M
J TA
S
0.010 (0.25)
B
S
F R X 45 _ C -T-
18X SEATING PLANE
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.150 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF D DIMENSION AT MAXIMUM MATERIAL CONDITION. MILLIMETERS INCHES DIM MIN MAX MIN MAX A 12.65 12.95 0.499 0.510 B 7.40 7.60 0.292 0.299 C 2.35 2.65 0.093 0.104 D 0.35 0.49 0.014 0.019 F 0.50 0.90 0.020 0.035 G 1.27 BSC 0.050 BSC J 0.25 0.32 0.010 0.012 K 0.10 0.25 0.004 0.009 M 0_ 7_ 0_ 7_ P 10.05 10.55 0.395 0.415 R 0.25 0.75 0.010 0.029
G
K
M
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FACT DATA 5-6
*MC74AC521/D*
MC74AC521/D

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