Counter ICs

A Shift Register is a sequential logic device made up of a cascade of flip-flops, through which a sequence of bits are ’shifted’. These devices are commonly used to convert between serial and parallel interfaces.

How it works – basic example

In a Shift Register the output of each flip-flop is connected to the input of the next flip-flop in the cascade. With each cycle of the connected clock, the bits are ’shifted’ down the cascade by one flip-flop.

A simple analogy to understand the basic theory or operation would be to consider a glass tube with an opening both ends, and placing a ball marked ’0’ or ’1’ into one end of the tube at a regular intervals.

As each ball is placed into the tube, all the balls are ’shifted’ along by one position. The sequence in which the balls marked ’0’ and ’1’ where fed in is preserved. Also each time one ball is fed in, the ball that has been in the cascade the longest drops out. So if the tube can contain 4 balls at any one time, this could be described as a 4-bit Shift Register.

Common Types of Shift Register

• Serial-in serial-out (SISO) – In this type of Shift Register, the data input and output is serial. With each clock cycle a new bit is fed into the cascade, with the bit furthest along the cascade exiting as an output. So in a 4-bit register, the output trails the input by 4 clock cycles. This matches the simple example above, with the ball that exits the tube being the output.

• Serial-in parallel-out (SIPO) – In this configuration data is converted from serial into parallel format. As described for the SISO variant above, data is fed in serially and shifted down the cascade, the difference is that each flip-flop has an output, allowing the entire bit array to be output simultaneously as a parallel output. This may be done using a latched of buffered output.

• Parallel-in serial-out (PISO) – This variant takes a parallel input and converts into a serial output. To do this the shift register must implement a write/shift sequence. The parallel data input is (written) into each flip-flop of the array simultaneously in one clock cycle, then for the next cycles the register goes into shift mode as the bits are shifted down the flip-flop cascade, being output as serial data. The process then repeats.

• Parallel-in parallel-out (PIPO) – This type of register differs slightly from the others in that inputs and outputs of each flip-flop in the array are not interconnected. Each flip-flop takes one bit of the parallel input, stores it for a cycle, and then outputs the data simultaneously with the other flip-flops in the register, creating a parallel output that matches the input. Like the SISO type above, PIPO variants can be used to temporarily store data, or act a time delay device.

• Universal Shift Register – A configurable Shift Register that can be programmed to act as a SISO, SIPO, PISO or PIPO device, often on the fly.

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Description Price Package Type Logic Function Number of Stages Logic Family Mounting Type Counter Type Operation Mode Number of Elements Pin Count Minimum Operating Supply Voltage Maximum Operating Supply Voltage Dimensions Length Width
RS庫存編號 145-0936
製造零件編號SN74LV161APW
HK$1.723
毎管:90 個
單位
TSSOP Counter 4 LV Surface Mount Binary Up Counter 1 16 2 V 5.5 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS庫存編號 671-1753
製造零件編號MM74HC164M
HK$2.862
/個 (每包:5個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 8.75 x 4 x 1.5mm 8.75mm 4mm
RS庫存編號 663-0521
製造零件編號CD74HCT166M
HK$2.15
/個 (每包:10個)
單位
SOIC Shift Register 8 HCT Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 540-0095
製造零件編號TC74HC595AP(F)
BrandToshiba
HK$9.646
/個 (每包:5個)
單位
PDIP Shift Register 8 HC Through Hole - Serial to Serial/Parallel 1 16 2 V 6 V 19.25 x 6.4 x 3.5mm 19.25mm 6.4mm
RS庫存編號 171-3384
製造零件編號74HC164D
BrandToshiba
HK$0.876
個 (在毎卷:2500)
單位
SOIC Shift Register - 74HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 8.95 x 3.9 x 1.38mm 8.95mm 3.9mm
RS庫存編號 121-9068
製造零件編號TPIC6B596N
HK$10.01
毎管:20 個
單位
PDIP Shift Register 8 - Through Hole - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 24.33 x 6.35 x 4.57mm 24.33mm 6.35mm
RS庫存編號 662-9203
製造零件編號TPIC6B596DWR
HK$9.692
/個 (每包:5個)
單位
SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm
RS庫存編號 663-2098
製造零件編號SN74HC393D
HK$3.676
/個 (每包:10個)
單位
SOIC Counter, Divider 4 HC Surface Mount Binary Up Counter 2 14 2 V 6 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
RS庫存編號 170-7987
製造零件編號74HC165D,653
BrandNexperia
HK$1.011
個 (在毎卷:2500)
單位
SO Shift Register 8 74HC Surface Mount - Serial/Parallel to Serial 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 145-0474
製造零件編號SN74HC590ANE4
HK$2.761
毎管:25 個
單位
PDIP Counter 8 HC Through Hole Binary Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
全新
RS庫存編號 188-9228
製造零件編號STPIC6D595MTR
HK$2.543
個 (在毎卷:2500)
單位
SO Shift Register 8 - Surface Mount - Serial to Parallel 1 16 4.5 V 5.5 V 10 x 4 x 1.64mm 10mm 4mm
RS庫存編號 333-4665
製造零件編號CD74HCT4020E
HK$3.60
毎管:25 個
單位
PDIP Counter 14 HCT Through Hole Binary Up Counter 1 16 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 100-0763
製造零件編號SN74HC595N
HK$3.43
毎管:25 個
單位
PDIP Shift Register 8 HC Through Hole - Serial to Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 368-7874
製造零件編號HEF4094BT,652
BrandNexperia
HK$2.93
毎管:50 個
單位
SOIC Shift Register 8 4000 Surface Mount - Serial to Serial/Parallel 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 663-0086
製造零件編號CD74HC163M
HK$5.588
/個 (每包:10個)
單位
SOIC Counter 4 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 791-8753
製造零件編號74HC595BQ,115
BrandNexperia
HK$1.358
/個 (每包:50個)
單位
VQFN Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 3.6 x 2.6 x 0.95mm 3.6mm 2.6mm
RS庫存編號 177-6865
製造零件編號74HCT393D,652
BrandNexperia
HK$2.92
單位
SOIC Counter, Divider 4 HCT Surface Mount Binary Up Counter 2 14 4.5 V 5.5 V 8.75 x 4 x 1.45mm 8.75mm 4mm
RS庫存編號 178-4722
製造零件編號MC14060BDG
HK$2.711
毎管:48 個
單位
SOIC Counter, Divider 14 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 648-220
製造零件編號CD74AC163E
HK$13.16
單位
PDIP Counter 4 AC Through Hole Binary Up Counter 1 16 1.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 527-445
製造零件編號CD4040BE
HK$3.254
毎管:25 個
單位
PDIP Counter, Divider 12 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm