hd74hc668 Renesas Electronics Corporation., hd74hc668 Datasheet
hd74hc668
Related parts for hd74hc668
hd74hc668 Summary of contents
Page 1
... HD74HC668, HD74HC669 Synchronous UP/Down Decade Counter Synchronous Up/Down 4-bit binary Counter Description This synchronous presettable decade counter features an internal carry look-ahead for cascading in high-speed counting applications. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating. This mode of operation helps eliminate the output counting spikes that are normally associated with asynchronous (ripple-clock) counters ...
Page 2
... HD74HC668, HD74HC669 Pin Arrangement HD74HC668 Data inputs Enable P GND HD74HC669 Data inputs Enable P GND Rev.2.00 Mar 30, 2006 page U (Top view) U ...
Page 3
... HD74HC668, HD74HC669 Logic Diagram HD74HC668 U Load Enable P Enable T CK HD74HC669 U Load Enable P Enable T CK Rev.2.00 Mar 30, 2006 page ...
Page 4
... HD74HC668, HD74HC669 Timing Chart HD74HC668 Load A B Data inputs C D Clock U/D Enable P and Ripple carry output Load Rev.2.00 Mar 30, 2006 page Count up Inhibit Count down ...
Page 5
... HD74HC668, HD74HC669 HD74HC669 Load A B Data inputs C D Clock U/D P and Ripple carry output 13 Load Absolute Maximum Ratings Item Supply voltage range Input / Output voltage Input / Output diode current Output current V , GND current CC Power dissipation Storage temperature Note: The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of which may be realized at the same time ...
Page 6
... HD74HC668, HD74HC669 Recommended Operating Conditions Item Supply voltage Input / Output voltage Operating temperature *1 Input rise / fall time Note: 1. This item guarantees maximum limit when one input switches. Waveform: Refer to test circuit of switching characteristics. Electrical Characteristics Item Symbol V (V) CC Input voltage V 2 ...
Page 7
... HD74HC668, HD74HC669 Switching Characteristics (C Item Symbol V CC Maximum clock f 2.0 max Frequency 4.5 6.0 Propagation delay t 2.0 PLH time t 4.5 PHL 6.0 t 2.0 PLH t 4.5 PHL 6.0 t 2.0 PLH t 4.5 PHL 6.0 t 2.0 PLH t 4.5 PHL 6.0 Pulse width t 2.0 w 4.5 6.0 Setup time t 2.0 su 4.5 6.0 t 2.0 su 4.5 6.0 t 2.0 su 4.5 6.0 t 2.0 su 4.5 6.0 Hold time t 2.0 h 4.5 6.0 Output rise/fall t 2.0 TLH time t 4.5 THL 6.0 Input capacitance Cin — ...
Page 8
... HD74HC668, HD74HC669 Test Circuit V CC Input Pulse Generator = 50 Ω Z out Input Pulse Generator = 50 Ω Z out Note : 1. C includes probe and jig capacitance. L Rev.2.00 Mar 30, 2006 page Output QA U/D Output Clock A QB Output Output D Enable P QD Output Load C Ripple Enable T ...
Page 9
... HD74HC668, HD74HC669 Package Dimensions JEITA Package Code RENESAS Code P-DIP16-6.3x19.2-2.54 PRDP0016AE 0. JEITA Package Code RENESAS Code P-SOP16-5.5x10.06-1.27 PRSP0016DH Index mark Rev.2.00 Mar 30, 2006 page Previous Code MASS[Typ.] DP-16FV 1.05g Previous Code MASS[Typ ...
Page 10
... HD74HC668, HD74HC669 JEITA Package Code RENESAS Code P-SOP16-3.95x9.9-1.27 PRSP0016DG Index mark Rev.2.00 Mar 30, 2006 page Previous Code MASS[Typ.] FP-16DNV 0.15g NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT INCLUDE TRIM OFFSET. ...
Page 11
Keep safety first in your circuit designs! 1. Renesas Technology Corp. puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead ...