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MC54/74F378 PARALLEL D REGISTER WITH ENABLE
The MC54/74F378 is a 6-bit register with a buffered common enable. This device is similar to the F174 but with common Enable rather than common Master Reset. The F378 consists of six edge-triggered D-type flip-flops with individual D inputs and Q outputs. The Clock (CP) and Enable (E) inputs are common to all flip-flops. When the E input is LOW, new data is entered into the register on the LOWto-HIGH transition of the CP input. When the E input is HIGH the register will retain the present data independent of the CP input. This circuit is designed to prevent false clocking by transitions on the E input..
PARALLEL D REGISTER WITH ENABLE
FASTTM SCHOTTKY TTL
* * * *
6-Bit High-Speed Parallel Register Positive Edge-Triggered D-Type Inputs Fully Buffered Common Clock and Enable Inputs Input Clamp Diodes Limit High-Speed Termination Effects CONNECTION DIAGRAM (TOP VIEW)
VCC 16 Q5 15 D5 14 D4 13 Q4 12 D3 11 Q3 10 CP 9
J SUFFIX CERAMIC CASE 620-09
16 1
16 1
N SUFFIX PLASTIC CASE 648-08
16 1
D SUFFIX SOIC CASE 751B-03
1 E
2 Q0
3 D0
4 D1
5 Q1
6 D2
7 Q2
8 GND
ORDERING INFORMATION
MC54FXXXJ MC74FXXXN MC74FXXXD Ceramic Plastic SOIC
FUNCTION TABLE
Inputs E H L L
H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High Impedance
Output Dn X H L Qn No Change H L
CP
LOGIC SYMBOL
14 13 11 6 4 3 1
D5 D4 D3 D2 D1 D0 E
Q5 Q4 Q3 Q2 Q1 Q0 CP 9
15 12 10 7 5 2
VCC = PIN 16 GND = PIN 8
FAST AND LS TTL DATA 4-173
MC54/74F378
LOGIC DIAGRAM
D0 CP D1 D2 D3 D4 D5
CP E
D Q
CP E
D Q
CP E
D Q
CP E
D Q
CP E
D Q
CP E
D Q
E Q0 Q1 Q2 Q3 Q4 Q5
GUARANTEED OPERATING RANGES
Symbol VCC TA Supply Voltage Operating Ambient Temperature Range Parameter 54, 74 54 74 IOH IOL Output Current -- HIGH Output Current -- LOW 54, 74 54, 74 Min 4.5 -55 0 Typ 5.0 25 25 Max 5.5 125 70 -1.0 20 mA mA Unit V C
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 54, 74 74 VOL IIH Output LOW Voltage Input HIGH Current 2.5 2.7 0.5 20 0.1 IIL IOS ICC Input LOW Current Output Short Circuit Current (Note 2) Power Supply Current - 60 30 -0.6 -150 45 Min 2.0 0.8 -1.2 Typ Max Unit V V V V V V A mA mA mA mA Test Conditions Guaranteed Input HIGH Voltage Guaranteed Input LOW Voltage VCC = MIN, IIN = -18 mA IOL = - 1.0 mA IOL = - 1.0 mA IOL = 20 mA VCC = 4.50 V VCC = 4.75 V VCC = MIN
VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.5 V VCC = MAX, VOUT = 0 V VCC = MAX, VCP = 0 V
NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type. 2. Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA 4-174
MC54/74F378
AC CHARACTERISTICS
54/74F TA = +25C VCC = 5.0 V CL = 50 pF Symbol fmax tPLH tPHL Parameter Maximum Input Frequency Propagation Delay CP to Qn Min 80 3.0 3.5 Typ 140 5.5 6.0 7.5 8.5 Max 54F TA = -55C to +125C VCC = 5.0 V 10% CL = 50 pF Min 80 3.0 3.5 9.5 10.5 Max 74F TA = 0C to +70C VCC = 5.0 V 10% CL = 50 pF Min 80 3.0 3.5 8.5 9.5 Max Unit MHz ns
AC OPERATING REQUIREMENTS
54/74F TA = +25C VCC = 5.0 V Symbol ts(H) ts(L) th(H) th(L) ts(H) ts(L) th(H) th(L) tw(H) tw(L) Parameter Setup Time, HIGH or LOW Dn to CP Hold Time, HIGH or LOW Dn to CP Setup Time, HIGH or LOW E to CP Hold Time, HIGH or LOW E to CP CP Pulse Width, HIGH or LOW Min 4.0 4.0 0 0 6.0 6.0 2.0 2.0 4.0 6.0 Typ Max 54F TA = -55C to +125C VCC = 5.0 V 10% Min 4.0 4.0 0 0 6.0 6.0 2.0 2.0 4.0 6.0 max 74F TA = 0C to +70C VCC = 5.0 V 10% Min 4.0 4.0 0 0 6.0 6.0 ns 2.0 2.0 4.0 6.0 ns ns Max Unit
FAST AND LS TTL DATA 4-175

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